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The best fertilizer for tomatoes is the one that supplies a nutrient your soil actually lacks. Start with a soil test, then choose a suitable fertilizer type—not a five-product stack. Too much nitrogen can produce leafy plants at the expense of flowers and fruit, while extra phosphorus or potassium may be unnecessary.
How to choose fertilizer for tomatoes
Use a soil test as your starting point. It can identify nutrient needs and soil conditions that affect availability; recommendations should account for soil type, pH, and nutrients already present. UC IPM calls preplant soil testing the primary tool for assessing crop nutrient needs, and the University of Missouri Extension describes testing as a reliable basis for nutrient recommendations. UC IPM · University of Missouri Extension
On a fertilizer label, the three-number N-P-K analysis refers to nitrogen (N), phosphorus (P), and potassium (K). Match the analysis to the recommendation rather than choosing the highest numbers or assuming that more fertilizer means more tomatoes. Local extension guidance and the product label should determine how much and when to apply.
The five fertilizer choices, matched to the situation
These are five useful fertilizer types or situations, not a ranking from yield trials. They are alternatives to choose among according to need; do not apply all five together.
#1 Best Overall
- Instantly feeds to grow bigger, more bountiful vegetables versus. unfed plants
- Feed every 1-2 weeks
- Great for tomatoes and vegetables
- Use with Miracle-Gro Garden Feeder or any watering can
- Safe for all plants, guaranteed not to burn when used as directed
| Fertilizer type | When it may fit | What to know |
|---|---|---|
| Complete vegetable fertilizer | A soil test or local recommendation calls for a mixed nutrient source, or no test is available and local guidance offers a general starting point. | Purdue gives 5-10-5, 10-10-10, and 6-10-4 as examples; UC IPM lists 5-10-5, 5-10-10, 8-16-16, and 12-12-12 as common mixed fertilizers. These are examples, not evidence that one blend yields more than another. Follow the local recommendation and label. |
| Low- or no-phosphorus fertilizer | The soil test shows phosphorus is already adequate or does not recommend additional phosphorus. | UMN Extension advises low- or no-phosphorus fertilizer unless a soil test calls for P, noting that many Minnesota soils already contain enough. That soil pattern should not be assumed for every region. |
| Nitrogen-only source | Soil and amendment history indicate a nitrogen need, but phosphorus and potassium are adequate. | UC IPM names urea, ammonium sulfate, calcium nitrate, and ammonium nitrate as nitrogen sources. Choose only as advised locally and by the label; commercial rate guidance is not a home-garden recipe. |
| Compost or well-rotted manure | You want to add organic matter and nutrients while preparing the soil. | These amendments contribute nutrients, so include them when assessing additional fertilizer needs. They do not guarantee that no other nutrient is needed. UMN cautions against using fresh manure in home gardens. |
| Water-soluble fertilizer | A local recommendation calls for a soluble product or that application format suits the specific task. | Iowa State gives a dilute soluble-fertilizer example after transplanting, but that regional practice does not establish that soluble products increase yield compared with granular fertilizer. |
Why more fertilizer can mean fewer tomatoes
Excess nitrogen favors leaves over fruit
Too much nitrogen can drive lush vine growth and delay flowering and fruiting. Purdue advises against using high-nitrogen lawn fertilizer on tomatoes; UC IPM also associates excess nitrogen with excessive vine growth and increased fruit-mold risk. Avoid treating a green, vigorous-looking plant as proof it needs more nitrogen.
Extra phosphorus and potassium are not automatic benefits
Use soil-test results to decide whether more phosphorus or potassium is needed. UMN recommends applying P and K based on test results, while a UF/IFAS review summarizes Florida evidence that surplus phosphorus can accumulate without improving yield. Neither point means every garden is phosphorus-sufficient; local soil conditions and test results matter.
Rank #2
- FEEDS UP TO 3 MONTHS: Miracle-Gro Shake 'N Feed Tomato, Fruit & Vegetable Plant Food is a plant fertilizer that feeds plants for up to 3 months, and nourishes above and below the soil
- FORMULATED WITH CALCIUM: This plant food for vegetables contains calcium to help form stronger cell walls, producing better quality and longer-lasting fruits and vegetables
- WHERE TO USE: For use with vegetable, fruit, and tomato plants, whether in-ground or indoor or outdoor container plants
- HOW TO APPLY: Apply this garden product evenly onto the soil and work into the top 1-3 inches of soil for in-ground plants, or lightly work into the soil of established container plants; water to start feeding
- COVERAGE: One 4.5 lb. container of Miracle-Gro Shake 'N Feed Tomato, Fruit & Vegetable Plant Food feeds up to 128 sq. ft.; reapply every 3 months and water regularly for a beautiful garden all season long
Count compost and manure in the nutrient picture
Compost and manure can supply nutrients as well as organic matter. UC IPM notes that where soil has been properly amended with compost or manure, nitrogen may be the only nutrient needed, if any; UMN likewise says additional fertilizer depends on how much organic material was used.
When and how to apply
Timing depends on the nutrient, the crop’s needs, and the product directions. UC IPM describes fertilizer use from preplant through first red fruit, with phosphorus and zinc best applied preplant or as starter at seeding or transplanting; potassium may be applied preplant, sidedressed, or through fertigation during the season. Those are guidance options, not a universal schedule for every home garden.
Rank #3
- Burpee Organic All Purpose Granular Plant Food is formulated for long-lasting results
- The easy-to-apply granules release essential nutrients immediately and continue to provide a continuous stream of plant food for up to 3 months
- Contains nutrients, plants will produce superior results throughout the season
- Omri listed for organic use
- Since 1876: Generations of customers have trusted Burpee to deliver the highest quality products and service. Gardeners rely on Burpee for accurate plant information and how-to tips that make gardening easier and more successful. Let’s grow together!
- Before planting: Get a soil test and incorporate only the amendments and fertilizer recommended for your soil. Purdue advises incorporating fertilizer during soil preparation.
- At planting or during growth: Apply only if the test, local guidance, or a specific recommendation calls for it. UC IPM advises keeping home-garden fertilizer away from stems and watering after band application.
- Use the product label: Follow its crop directions, application rate, placement, and precautions. Do not transfer commercial per-acre recommendations to a backyard bed.
Schedules such as light, frequent nitrogen applications appear in UC IPM guidance, but the right timing and amount depend on location, soil test, fertilizer analysis, and label directions. Avoid fertilizing by habit when the need has not been established.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Practical decision checklist
- Have you tested the soil, or checked local extension guidance for your area?
- Does the recommendation call for N, P, K, or a combination?
- Have compost or manure already contributed nutrients?
- Does the product’s N-P-K analysis match the identified need?
- Are you following home-garden directions on the label rather than a commercial production rate?
For region-specific recommendations, consult UMN Extension, Purdue Extension, and the relevant local extension service. UGA’s commercial tomato guidance also emphasizes accounting for soil type, pH, and residual nutrients; its commercial rates should not be repurposed as home-garden instructions. UGA Cooperative Extension
Quick Recap
Best Value
- Contains natural ingredients to feed microbes in the soil
- Specially formulated with micronutrients to help plants grow strong and produce more fruits and vegetables versus unfed plants
- Calcium helps form stronger cell walls, producing better quality and longer-lasting fruits and vegetables. Plus, it helps prevent disorders in edible crops commonly associated with calcium deficiency.
- Feeds up to 3 months; For use in ground and in containers
- Now contains natural ingredients that helps feed and nourish above and below soil, for even better quality and longer lasting fruits and vegetables versus unfed plants
Rank #4
- Let our professionally formulated plant food help you grow bigger, juicer and plumper tomatoes in your garden
- Specifically formulated for optimal performance throughout the life cycle on all varieties of tomatoes
- Super, super concentrated - A little goes a LONG way
- Dilute two teaspoons of product into one gallon of water and apply weekly during the whole life cycle
- Farmer's Secret brings the same scientifically backed formula development process farmers get to YOUR garden… get in on the secret!
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