Best Fertilizer for Vegetable Gardens (2026): Organic, Slow-Release and Liquid Picks

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The best fertilizer for most vegetable gardens is Dr. Earth Home Grown Tomato, Vegetable & Herb Fertilizer, an organic 4-6-3 granular feed that two reviewers back: one reviewer has used it in a home vegetable garden for years, and Bob Vila's tester named it the best of eight organic fertilizers for vegetables after a month of feeding a garden with them. Before you buy any bag, six of the seven extension services we read point to the same first step: test the soil, because a test tells you which nutrients your garden is short of and which it already has plenty of.

If tomatoes and peppers fill most of the bed, Espoma Tomato-tone carries more potash (3-4-6) and 8% calcium by its listing. The other picks cover the all-purpose organic feed that won Bob Vila's test, for a garden of vegetables and flowers, a coated slow-release fertilizer you apply once for months, a water-soluble feed for transplants, and an organic fish and kelp liquid. Below the picks we set out what seven extension services say about feeding vegetables, how each kind of fertilizer works, how much nitrogen each label rate actually puts down, when to side-dress which crop, and what calcium on the label can and cannot do for blossom end rot.

Jump to: What extension services say | Granular, slow-release or liquid | Nitrogen per 100 square feet | When to feed | Tomatoes and calcium | Mistakes to skip

Start here: which vegetable fertilizer for your garden

• One organic bag for a bed of mixed vegetables: Dr. Earth Home Grown Tomato, Vegetable & Herb Fertilizer (pick 1).
• Mostly tomatoes, peppers, squash and melons: Espoma Tomato-tone (pick 2).
• Vegetables plus flower beds and shrubs from one organic bag: Jobe's Organics All-Purpose Granular (pick 3).
• Feed once in spring and leave it for months: Osmocote Smart-Release Flower & Vegetable (pick 4).
• A fast feed for new transplants or a pale, slow bed: Miracle-Gro Water Soluble Tomato Plant Food (pick 5).
• An organic liquid for containers and a mid-season boost: GS Plant Foods Liquid Fish & Kelp (pick 6).

Not sure your garden needs fertilizer at all? Read what the extension services say first. The University of Maryland Extension notes that many gardeners with well-established, high organic matter beds get large harvests without fertilizer, and a soil test is how you find out whether yours is one of them.

The best vegetable garden fertilizers, by job

1. Dr. Earth Home Grown Tomato, Vegetable & Herb Fertilizer: best overall

Home Grown is a dry organic fertilizer with a 4-6-3 analysis. Dr. Earth's nutrient statement puts all 4% of its nitrogen in water-insoluble form, which soil life has to break down before roots can take it up, and adds 7.5% calcium, 1% sulfur and small amounts of magnesium, iron and manganese. The maker lists plant, seaweed and fish ingredients plus mined minerals, and adds its own blend of soil microbes and mycorrhizal fungi. Dr. Earth says to use it at planting, when transplanting and on a regular schedule as a top dressing, in beds, containers or native garden soil. The linked listing is the 4 pound bag, Dr. Earth part 704P, which Amazon titles "Dr. Earth Organic 5"; Dr. Earth also sells 1, 12, 25 and 50 pound sizes. Gardening Products Review and the Amazon title call it Organic 5; Dr. Earth and Bob Vila call it Home Grown; the 4 lb bag carries part 704P in each.

Why it is the pick: it is the one vegetable fertilizer here that two reviewers put at the top for vegetables. The writer at Gardening Products Review names it the best overall fertilizer for vegetable gardens and says it has been in the writer's own garden for years. Bob Vila's tester, Mark Wolfe, fed eight organic fertilizers to a vegetable, herb and flower garden at their label rates for a month and named Home Grown the best for vegetables; he saw deep greening within 2 days, which he put down to its fine particles acting like a fast fertilizer. Dr. Earth's page names OMRI, OIM and NOP under the heading Organic Transparency, and Bob Vila's review notes the OMRI seal.

Good to know: the texture is uneven. Bob Vila's tester found it mostly sand-fine powder with larger pellets mixed in and had to take care in wind so the fine part did not blow away. The Gardening Products Review writer warns that its high humic acid content can cause trouble if you overapply it. The Dr. Earth page we read gives its nutrient content but no application rate, so use the rate printed on the bag. Like every low-analysis organic, it supplies less nitrogen per pound than a synthetic, so a poor soil may need more of it; Iowa State's extension service makes the same point about organics in general.

2. Espoma Tomato-tone: best for tomatoes and other fruiting crops

Tomato-tone is Espoma's organic granular fertilizer for tomatoes, with a 3-4-6 analysis and 8% calcium by its listing, and the listing says it can be used on all vegetables. Espoma's directions add peppers, squash and melons as fruiting crops it suits. To prepare a tomato bed, Espoma says to work 3 pounds (9 cups) into each 50 square feet, mixed 4 to 6 inches deep; for a single plant, mix 3 tablespoons into the soil at planting. After that, Espoma's page says to feed twice a month from May through August, at 3 tablespoons per plant or 1 cup down each side of every 5 feet of row, starting 10 to 14 days after the plant is established. The listing says it is a registered Organic Input Material, approved for organic gardening. The linked listing is the 18 pound bag; Espoma also sells 4 and 8 pound bags.

Why it is the pick: its potash, the third number, is the highest of the organic picks here, and Texas A&M AgriLife's horticulturist says the vegetables you harvest fruit from may need more phosphorus and potassium than leafy greens do. The Gardening Products Review writer calls it the top tomato fertilizer on the writer's list. The calcium is the part Espoma leads with: its listing says the 8% calcium is there to help prevent blossom end rot. Read the tomato section below before you count on that: the University of Wisconsin says the soil more often has plenty of calcium and the trouble is getting it to the fruit, with drought and swings in soil moisture among the causes.

Good to know: the Gardening Products Review writer notes a strong smell, which the review puts down to its being organic and flags for anyone feeding pots indoors. Twice a month is a more frequent schedule than the other granular picks. Espoma's directions say to spread it in a narrow band and keep it at least 3 inches from the stem.

3. Jobe's Organics All-Purpose Granular: best for a mixed vegetable and flower garden

An organic 4-4-4 granular feed, by Jobe's product page, for vegetables, flowers, shrubs and trees. Jobe's says to apply it every 4 to 6 weeks, and its listing says it contains archaea, microbes that break down organic material. The linked listing is the 4 pound bag; Jobe's page lists 1.5, 4, 6, 8 and 16 pound sizes.

Why it is the pick: it won the hands-on test. Bob Vila's tester put it first of the eight organic fertilizers he fed to his garden for a month: onion and cabbage plants greened up and put on new growth within a week, the new growth came in sturdy rather than lanky, the granules were even in size and easy to spread, and one feeding lasted more than a month. The Gardening Products Review writer names it the writer's best all-purpose pick for a garden that grows several kinds of plants, which is the reason to choose it over pick 1: one bag feeds the vegetable bed, the flower border and the shrubs.

Good to know: Bob Vila's tester notes that it supplies calcium, magnesium and sulfur but lacks some of the micronutrients found in other fertilizers in his test. The Gardening Products Review writer says the maker calls for reapplying every two or three weeks, while the Jobe's page we read says every 4 to 6 weeks; the bag in your hand is the one to follow. Neither the listing nor the Jobe's page we read gives a rate per square foot, so use the rate on the bag.

4. Osmocote Smart-Release Flower & Vegetable: best feed-once slow release

A synthetic 14-14-14 slow-release granular fertilizer; Osmocote's listing says soil temperature controls how its granules release their nutrients. The listing for the 4.5 pound container says it feeds for up to 4 full months. Osmocote's listing for the 8 pound size gives the rate: 1 scoopful (with the included scoop) per 4 square feet, mixed into the top 1 to 3 inches of soil, with 1 pound covering 40 square feet. The linked listing is the 4.5 pound container.

Why it is the pick: it is the least work of any fertilizer here. Iowa State's extension service says slow-release granulars feed over weeks or months, so a single spring feeding may be all you need, and the University of Florida's IFAS Extension says a controlled-release source lets you fertilize less often and keeps nutrients from washing out of the garden. For a raised bed, a row of containers or a busy summer, one measured feeding at planting covers most of the season. No reviewer we read tested it; it rests on Osmocote's listing and the extension advice above.

Good to know: it is synthetic, not organic, and Virginia Tech says "chemical fertilizers do not affect soil structure." Because its listing ties release to soil temperature, expect it to feed slowly while spring soil is still cold. Its listing says it will not burn plants even if applied at up to three times the recommended rate; Maryland's extension service warns that overapplied fertilizer of any kind can scorch leaves and dry out roots, and that extra nitrogen pushes leaves at the expense of fruit, so keep to the scoop.

5. Miracle-Gro Water Soluble Tomato Plant Food: best fast feed for transplants

A synthetic 18-18-21 powder that you dissolve in water. Miracle-Gro's page says to mix 1-1/2 tablespoons (the big end of the scoop in the box) in 1-1/2 gallons of water and wet the soil around the base of the plants every 7 to 14 days, or to use its Garden Feeder on a hose for larger gardens. Miracle-Gro says it works on all vegetables, naming tomatoes, squash, peppers, cucumbers and carrots, and its listing for the 3 pound box says that size feeds about 1,200 square feet of garden. The linked listing is the 1.5 pound box.

Why it is the pick: it is the fastest-acting feed here, and that is the job extension services give a soluble fertilizer. The University of Maryland Extension says to feed seedlings and transplants in spring with a soluble fertilizer dissolved in water and to switch to a granular as the plants grow, and Virginia Tech says gardeners often water in transplants with a fertilizer solution to speed root growth. Florida's IFAS Extension adds that water-soluble feeds work as a quick boost and are especially handy in containers. No reviewer we read tested it; it rests on Miracle-Gro's directions and the extension advice above.

Good to know: what feeds fast also runs out fast. Maryland notes that the nutrients in soluble fertilizers, nitrogen above all, get used up or leach away sooner than those in granular ones, and the label asks for a feeding every 7 to 14 days. Florida warns that overfed tomatoes and beans put on lots of leaves and little fruit. For containers, Iowa State says not to add a liquid or water-soluble fertilizer every time you water.

6. GS Plant Foods Liquid Fish & Kelp: best organic liquid

An organic 2-3-1 liquid made from hydrolyzed fish and Ascophyllum nodosum seaweed, OMRI Listed by both its maker and its Amazon listing. GS Plant Foods' page says to mix 2 ounces per gallon of water for outdoor plants every 2 to 3 weeks (its Amazon listing says every 2 to 4), or 1 tablespoon per gallon for houseplants every 2 weeks, applied as a soil drench or a foliar spray, early or late in the day rather than in midday sun. The linked listing is the 1 quart bottle; GS also sells gallon and larger sizes.

Why it is the pick: it is the liquid Bob Vila's tester chose. He mixed it at 1 tablespoon per gallon as a weekly feed for container plants and at 2 ounces per gallon as a soil drench and leaf spray for the in-ground garden, saw the plants respond well, noticed no strong fishy smell, and called it the most flexible product in his test. Florida's IFAS Extension describes the same kind of feed for gardeners who want to avoid chemical fertilizers: fish emulsion mixed with water and given every two to three weeks, and Virginia Tech counts fish emulsion and liquid kelp as good nutrient sources for transplants.

Good to know: at 2% nitrogen it is a supplement, not a whole-season feed for a big bed; Oregon State's extension service says fish emulsion "needs to be used more often to get the same effect" as other nitrogen sources. Feed the soil rather than counting on the leaf spray: Iowa State says that usually less than 5% of a foliar feed's nutrients get into the plant.

How we chose these

We compared the vegetable fertilizers in Amazon's catalog by their analysis (the three N-P-K numbers), their form (organic granular, coated slow-release, water-soluble powder or liquid), how often their makers say to apply them and the organic listing each label or listing states, from each Amazon listing and maker page: Dr. Earth for pick 1, Espoma for pick 2, Jobe's for pick 3, Osmocote's listings for pick 4, Miracle-Gro for pick 5 and GS Plant Foods for pick 6. Two roundups we found state how they reached their picks. Bob Vila's tester fed eight organic fertilizers to his vegetable, herb and flower beds at their label rates and watched growth and color for a month. The Gardening Products Review writer draws on years of personal use plus research, and the site notes that it received a free sample of the product it reviewed. Each pick says whose word it rests on.

For how to feed a vegetable garden, we read the extension services of the University of Maryland, the University of Florida, Iowa State, Texas A&M, Oregon State, Michigan State and Virginia Tech, and the University of Wisconsin's fact sheet on blossom end rot.

Our rules: each pick was in stock on Amazon on October 26, 2026, with a new offer in the buy box. Every application rate and interval on this page comes from the product's own label, listing or maker page and is named where it appears; the nitrogen table is arithmetic on those label rates, not a rate of ours. Organic listings (OMRI, Organic Input Material) are reported only where the product's label, listing or maker states them. We link no lawn fertilizer and no weed and feed product.

Also considered: fertilizers that missed the list and why

Espoma Garden-tone 3-4-4. Espoma's all-vegetable blend, with 5% calcium by its listing and a crop list on Espoma's page that runs from cool-season greens to summer squash and melons. It met our floor on October 26, 2026, and it suits anyone who wants Espoma for the whole bed. We gave the overall slot to pick 1, which two reviewers back, and Espoma's slot to Tomato-tone, which a reviewer backs for tomatoes; none of the reviews we read tested Garden-tone.

Miracle-Gro's Shake 'N Feed Tomato, Fruit & Vegetable. A 10-5-15 slow-release granular with calcium that Miracle-Gro says feeds for up to 3 months. It met our floor and does the same feed-once job as pick 4; Osmocote's listing gives the longer feeding window, up to 4 months.

Neptune's Harvest Fish & Seaweed 2-3-1. The same kind of organic liquid as pick 6, OMRI Listed by its maker, at 1/8 cup per gallon every one to two weeks outdoors by Neptune's directions. It met our floor; pick 6 is the one a reviewer tested.

Down to Earth Vegetable Garden 4-4-4. An organic blend that its maker says carries an OMRI listing, with the clearest rates we found: 3 to 6 pounds per 100 square feet for a new garden, then a side-dressing of 2 to 4 ounces once a month for established plants. It met our floor and is worth a look for a large garden; none of the reviews we read tested it.

FoxFarm Happy Frog Tomato & Vegetable. A 5-7-3 organic blend with calcium by its listing, the Gardening Products Review writer's best organic pick. The same review puts pick 1 first overall, and Bob Vila's test, which did not include FoxFarm, backs pick 1 too. For fruiting crops, the review adds that, depending on the soil's potassium, plants may need a higher-potassium feed once they flower; pick 2 carries more potash, which is why it holds the fruiting-crop slot.

Burpee Natural Organic All-Purpose. Bob Vila's best value: a 4-4-4 organic feed with 5% calcium that its tester found fed steadily without a sudden flush. It met our floor; pick 3 placed above it in the same test.

Lawn fertilizers and weed and feed. We link none. Texas A&M's horticulturist warns against using lawn fertilizer in a vegetable garden because its nitrogen is too high and can injure vegetables.

Test before you feed: what seven extension services say

Six of the seven extension services we read start in the same place: a soil test. Michigan State's advice is short: don't guess, soil test. Maryland says to apply fertilizer based on a laboratory soil test and the needs of the plants. Iowa State says to always start with a soil test, and Texas A&M says a test is a good guide when you garden ground you have not gardened before. A test also catches the nutrient you do not need: Maryland says that if a test shows high phosphorus and potassium, a nitrogen-only fertilizer is the better choice, because adding more P and K does not help the roots and may harm useful soil microbes. Our soil test kit guide compares mail-in lab kits and home kits, and walks through reading a report.

Where they differ is the ratio to buy. Florida's IFAS Extension says most vegetables do best with a balanced fertilizer such as 6-6-6. Iowa State argues the other way for most home gardens: plants take up nitrogen, phosphate and potash at about 5-1-2 to 5-1-3, so a balanced fertilizer nearly always overapplies phosphate and potash, and an all-purpose mix such as 3-1-2 or 5-1-2 is the better buy. Maryland splits the difference: without a soil test, choose a complete fertilizer, either balanced or with extra nitrogen. A soil test settles which advice fits your garden.

Two more points from Maryland are worth knowing before you spend anything. Soil organic matter feeds plants too: Maryland estimates that each 1% of organic matter makes about 0.4 pounds of nitrogen for every 1,000 square feet available to plants, so a soil at 5% supplies about the 2 pounds a typical vegetable garden is advised to get. That is why compost matters, and our compost bin guide and compost tumbler guide cover making your own. But organic matter releases its nitrogen slowly and peaks around July, so it can run short in early spring and when fruit starts to set, which is where a fertilizer earns its place. Iowa State puts it plainly: compost supplements a fertilizer but rarely replaces one.

Organic granular, slow-release, water-soluble or liquid: how each kind feeds

The form matters as much as the numbers. A granular organic and a water-soluble synthetic with the same nitrogen on the bag reach the roots weeks apart, so the extension services match each form to a moment in the season rather than calling one of them best.

Many gardeners combine them, and the extension services suggest exactly that. Florida recommends putting down both a quick-release and a slow-release source at planting, so young plants have something to use at once and the rest arrives as they grow. Maryland's version is a soluble feed for transplants followed by a granular one. Iowa State describes gardeners who spread composted manure in fall and still top-dress a granular fertilizer after planting long-season crops such as tomatoes. In practice that can be pick 5 or pick 6 at transplanting and pick 1, 2, 3 or 4 in the bed.

On organic versus synthetic, Texas A&M's horticulturist says plants do not care where their nutrients come from as long as the need is met. The differences are practical. Iowa State notes that organics are lower in analysis and so less likely to burn when overapplied, may not carry every nutrient, and build soil quality over time; synthetics can carry a full range of nutrients but do nothing for soil structure, Virginia Tech adds. Florida says that in a vegetable garden synthetic fertilizer is usually needed unless you apply very large amounts of organic fertilizer.

What the numbers on the bag mean, and how much nitrogen each label rate puts down

The three numbers give nitrogen, phosphate and potash as percentages of the bag's weight, in that order. In Florida's example, 16-2-8 in a 50 pound bag means 8 pounds of nitrogen. That makes it possible to check what a label rate delivers against the University of Maryland's general advice of 2 pounds of nitrogen for every 1,000 square feet of vegetables, which is 0.2 pounds (3.2 ounces) for every 100 square feet, and 0.3 pounds (4.8 ounces) for every 100 square feet for heavy feeders such as tomatoes, broccoli and beets.

The table below takes each product whose label, listing or maker page gives a rate by area, converts that rate to pounds per 100 square feet, and multiplies by the nitrogen percentage. It is arithmetic, not advice: apply what the bag says, not what the table works out.

What it shows: Espoma's soil-preparation rate lands a little under Maryland's figure and Down to Earth's range brackets it, and the labels then add feedings through the season (Tomato-tone twice a month, Down to Earth a monthly side-dressing). The two feed-once synthetics put down about 5.6 ounces of nitrogen in one application, which their listings say feeds for up to three or four months. It also explains why organic bags call for so much more product: the 0.35 pounds of nitrogen in 2.5 pounds of a 14 percent synthetic would take nearly 12 pounds of a 3 percent organic. Picks 1 and 3 are not in the table because the pages we read give no rate by area, and picks 5 and 6 are mixed by the gallon of water rather than spread by the square foot.

When to feed: at planting, side-dressing and by crop

Most of a garden's fertilizer goes on before or at planting, and the rest goes on as a side-dressing once the plants are growing. Michigan State's schedule is the clearest: spread all the phosphorus and potassium and two-thirds of the season's nitrogen 7 to 10 days before planting, then side-dress the last third 6 to 8 weeks after the garden is up, in a band 2 inches from the plants, worked in lightly or watered in. Maryland says to mix dry fertilizer 2 to 4 inches into the soil, move mulch aside first and put it back after, and water it in if no soaking rain is due. Do not start too early: Maryland says cool spring soil limits how much nutrient the soil's organic matter releases.

How often after that depends on the soil. Florida says vegetables in sandy, well-drained soil usually get a balanced fertilizer every three to four weeks, while clay soils need less, about one feeding every four to six weeks once plants are in. If your beds are heavy clay, our guide on how to improve clay soil covers building the organic matter that holds those nutrients. Beds filled with a lot of new organic matter or a highly organic bagged mix, common in raised beds, are the other case to watch: Oregon State notes that little nitrogen is available from that organic matter at first and the microbes breaking it down need nitrogen themselves, so side-dressing nitrogen through the season matters more there; our raised bed guide covers what to fill one with, and our potting soil guide compares bagged mixes for containers.

Oregon State's extension service gives side-dressing times by crop. Nitrogen is the nutrient most often added mid-season, it says, because it washes out of the soil over winter and moves quickly to the roots when watered in.

Herbs need less. Espoma's Garden-tone directions say herbs only need feeding at planting or after a large harvest. Keep fertilizing fruiting crops once they start bearing: Florida says not to stop when fruit appears, but to keep feeding as needed so production continues.

Tomatoes, calcium and blossom end rot

Three of the fertilizers on this page lead with calcium. Tomato-tone's listing says its 8% calcium helps prevent blossom end rot, Dr. Earth lists 7.5% calcium in Home Grown, and Miracle-Gro says its Shake 'N Feed for tomatoes, fruit and vegetables contains calcium to help prevent disorders linked to calcium deficiency. What the University of Wisconsin's plant disease clinic says about blossom end rot puts those claims in proportion.

Blossom end rot "is caused by a lack of calcium in the fruit," Wisconsin says, and that can come from low calcium in the soil, but more often the soil has plenty and the plant cannot move it to the fruit. Drought stress, swings between wet and dry soil, root damage, waterlogged or cold soil and high levels of ammonium, potassium or magnesium all get in the way. Calcium travels with the water a plant loses through its leaves, so it goes to the leaves first, and Wisconsin says overfertilizing with nitrogen makes this worse by producing more leaves. Virginia Tech adds that soils limed properly usually supply enough calcium.

So the fix starts with water, not the bag. Wisconsin's advice: water evenly, mulch to hold moisture in dry spells, avoid cultivating close enough to cut roots, use nitrate rather than ammonium forms of nitrogen, do not overfertilize, and test the soil to find out whether it really is short of calcium; if it is, add calcium and keep an eye on pH, which Wisconsin puts at about 6.5 for most vegetables. A calcium-rich tomato fertilizer such as pick 2 is a reasonable choice for a tomato bed, but it will not stop blossom end rot on its own if the watering is uneven.

Mistakes that waste fertilizer or hurt plants

• Using lawn fertilizer in the vegetable garden. Texas A&M says its nitrogen is too high and can injure vegetables, and Iowa State says the high nitrogen in lawn fertilizers promotes leafy growth and holds back flowering.
• Treating more as better. Maryland says to follow the label rate: extra nutrients will not necessarily stay in the soil for later, overapplied fertilizer can burn leaves and dry out roots, and too much nitrogen can mean lush leaves, less fruit and more pest and disease trouble.
• Piling granules against stems or leaving them on leaves. Maryland warns that both can burn plant tissue, and Florida says to water after applying to rinse particles off the foliage.
• Feeding before heavy rain or onto the path. Florida says to hold off if heavy rain is forecast within 24 hours and to sweep up anything spilled on a hard surface; Maryland says to fertilize only where roots will grow, not the walkways, and to pull weeds first so they do not take the feed.
• Counting on leaf sprays. Iowa State says usually less than 5% of a foliar feed gets into the plant, with a high risk of salt burn above 80F or in low humidity.
• Fresh manure close to harvest. Iowa State says to wait 90 days after a manure application before harvesting crops that do not touch the soil and 120 days for those that do, and that well-composted manure, best spread in fall, lowers the risk.
• Fertilizing a problem fertilizer cannot fix. Maryland notes that pale, slow, low-yielding plants can be suffering from crowding, too little sun, compacted soil or root-knot nematodes, which look like a nutrient shortage; Iowa State says to check watering, light and pests before reaching for the bag.

Related guides

Start with the soil: our soil test kit guide tells you what to feed, and our clay soil guide covers the organic matter that holds it. For homemade organic matter, see our compost bin guide and compost tumbler guide, and for building soil over winter, our cover crops guide. Planning a new bed? Our raised bed guide covers the size, materials and fill.

Frequently asked questions

What is the best fertilizer for a vegetable garden?

For most gardens, Dr. Earth Home Grown, an organic 4-6-3 granular for tomatoes, vegetables and herbs that two reviewers put at the top for vegetables. Test the soil first: six of the seven extension services we read start there, and a test can show that your soil needs only nitrogen, or less than you think.

What N-P-K ratio is best for vegetables?

The extension services disagree. Florida's IFAS Extension says most vegetables do best with a balanced fertilizer such as 6-6-6, while Iowa State says a balanced fertilizer usually applies too much phosphate and potash and prefers an all-purpose ratio such as 3-1-2 or 5-1-2. A soil test tells you which nutrients your garden actually lacks; leafy greens lean on nitrogen and fruiting crops on phosphorus and potassium, Texas A&M says.

Is organic or synthetic fertilizer better for vegetables?

Plants use both. Texas A&M's horticulturist says plants do not care where their nutrients come from as long as the need is met. Organic fertilizers are lower in analysis, less likely to burn and build soil over time, Iowa State says; synthetics generally act faster, Virginia Tech says. Many gardeners use both, and Florida suggests pairing a quick-release and a slow-release source at planting.

How often should I fertilize my vegetable garden?

Follow the label: the picks here range from every 7 to 14 days for a water-soluble feed to up to 4 months for a coated slow-release one. As a guide, Florida says every three to four weeks in sandy, well-drained soil and every four to six weeks in clay, and Michigan State puts a third of the season's nitrogen on as a side-dressing 6 to 8 weeks after planting.

When should I fertilize a vegetable garden?

Mostly before planting, then again as plants grow. Michigan State says to put down the phosphorus, potassium and two-thirds of the season's nitrogen 7 to 10 days before planting, and Maryland says to feed transplants with a soluble fertilizer, then switch to a granular one. Maryland also says not to fertilize too early, because cool spring soil limits how much nutrient the soil's organic matter releases.

Can I use lawn fertilizer on my vegetable garden?

No. Texas A&M's horticulturist says the nitrogen in lawn fertilizers is too high and can injure vegetables. We link no lawn fertilizer or weed and feed product on this page.

Is compost enough to fertilize a vegetable garden?

Sometimes. Maryland says many gardeners with well-established, high organic matter beds get large harvests without fertilizer, and estimates that a soil at 5% organic matter releases about the 2 pounds of nitrogen for every 1,000 square feet a vegetable garden is advised to get. Iowa State says compost is a supplement rather than a replacement for most gardens, because its nutrients are low and slow to release.

What is the best fertilizer for tomatoes?

Espoma Tomato-tone, an organic 3-4-6 with 8% calcium by its listing, is our pick for a tomato bed. Calcium alone will not stop blossom end rot, though: the University of Wisconsin says the soil more often has plenty of calcium and the plant cannot move it to the fruit, with drought and swings in soil moisture among the causes, and that too much nitrogen makes it worse, so water evenly and mulch.

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