Best Organic Fertilizer For Plants for Gardens and Houseplants

#1 · Best Overall

1. Back to the Roots All-Purpose Plant Food

• Weight: 5 lb

Best for: Vegan blend for varied plants.

Why it ranks #1: Its plant- and mineral-based blend suits herbs, flowers, fruit, and vegetables, with kelp, alfalfa meal, mycorrhizae, and clear two-to-four-week directions.

A 100% plant- and mineral-based blend sets Back to the Roots All-Purpose Plant Food apart for gardeners avoiding synthetic chemicals and factory-farmed animal waste. Kelp, alfalfa meal, mycorrhizae, and rock phosphate combine in a five-pound size for feeding a broad range of plants.

Kelp and alfalfa meal provide long-lasting nutrition, while mycorrhizae are included to promote strong root growth; the blend also includes rock phosphate minerals to support harvests. The five-pound bag suits gardeners feeding multiple plants rather than relying on a small concentrate. Directions call for mixing one tablespoon with one gallon of water and applying every two to four weeks, giving users a repeatable liquid-feeding routine. Gloves are recommended when handling, and the product should be kept away from children and pets.

Skip it if you want a ready-to-use granular application rather than mixing each feeding; Espoma Plant-Tone comes in granules.

Choose this for gardeners seeking a vegan, plant-and-mineral-based blend for varied plants and willing to mix it into water. Its regular two-to-four-week schedule suits hands-on feeding better than a multi-month granular routine.

Listed on Amazon as: Back to The Roots Organic All-Purpose Plant Food (5 lb. Value Size), Premium Blend, Safe & Sustainable Vegan Formulation Made with Kelp and Alfaalfa Meal, Mycorrhize, and Rock Phosphate Minerals

#2 · Broadest Plant Range

2. Organic Plant Magic Fertilizer

• Weight: 8 oz
• Form: Powder

Best for: Concentrated all-plant feeding.

Why it ranks #2: The water-soluble concentrate is listed for vegetables, flowers, herbs, fruit, trees, gardens, and indoor plants; half a pound makes 32-plus gallons.

A half-pound of Organic Plant Magic powder makes more than 32 gallons of liquid plant food, giving gardeners a concentrated option for feeding varied plants. Its all-purpose use spans vegetables, flowers, herbs, fruit, trees, gardens, and indoor houseplants, so one concentrate can serve a mixed collection.

The water-soluble powder expands with water and is specified to make 32+ gallons, which lets a small bag supply repeated liquid feedings across different plant types. Its stated range includes houseplants as well as vegetables, flowers, herbs, fruit, trees, and gardens, making it useful when a household tends indoor and outdoor plants. The listing describes rapid-release and slow-release options, but does not specify application intervals for this particular bag; follow its directions and store below 120 degrees.

Skip it if you prefer a granular feed with a stated multi-month duration; Dr. Earth Organic 5 feeds vegetable gardens for several months.

This fits growers who want one concentrated liquid feed across houseplants and a varied garden, and who are comfortable mixing powder with water. Its stated volume is useful, but the supplied information leaves the application schedule unspecified.

Listed on Amazon as: Organic Plant Magic Fertilizer & Plant Food for House Plants & Garden 1/2lb

#3 · Balanced Granules

3. True Organic All Purpose Plant Food

• Weight: 4 lb
• Form: Granules

Best for: Soil-focused all-purpose granules.

Why it ranks #3: This granular formula serves fruits, vegetables, flowers, herbs, and foliage, with listed 5-4-5 NPK and additional calcium and sulfur.

A formula that includes slow-release nitrogen, calcium, and sulfur distinguishes True Organic All Purpose Plant Food for gardeners seeking broad plant nutrition alongside soil enrichment. The four-pound granular bag covers 87 square feet and is listed for fruits, vegetables, flowers, herbs, and foliage.

Its guaranteed nutrient profile lists 5% nitrogen, including 3.75% slow-release nitrogen, plus 4% phosphate, 5% potash, 4% calcium, and 1% sulfur. Those nutrients are paired with seabird guano, shrimp and crab shell meal, soybean meal, and fish bone meal in the organic blend. The stated 87-square-foot coverage helps gardeners plan use across a defined area, and the product is intended for varied edible and ornamental plants. The ingredient list includes poultry manure, a consideration for buyers with ingredient preferences.

Skip it if you avoid animal-derived ingredients in fertilizer; Back to the Roots All-Purpose Plant Food is plant- and mineral-based.

This suits gardeners feeding a defined area of mixed edible and ornamental plants who value a detailed nutrient profile and soil-enrichment focus. Its ingredient blend includes poultry manure and other animal-derived materials, so check that fit first.

Listed on Amazon as: True Organic All Purpose Plant Food – Organic Fertilizer for Fruits, Vegetables, Flowers, and Herbs – 4lb Bag Covers 87 sq. ft.

#4 · Long-Lasting Feed

4. Espoma Plant-Tone

• Weight: 4 lb
• Form: Granules

Best for: Slow-feed flower and garden beds.

Why it ranks #4: Slow-breaking organic ingredients provide a longer-lasting nutrient reservoir, and the 5-3-3 blend is listed for flowers, vegetables, trees, and shrubs.

Espoma Plant-Tone’s slow breakdown creates a long-lasting reservoir of nutrients, making it a fit for gardeners who prefer granular feeding across mixed beds. Its listed uses include flowers, vegetables, trees, and shrubs, while Bio-tone formula enhances its blend of natural and organic ingredients.

Plant-Tone’s 5-3-3 formula and slowly breaking-down organic ingredients provide a sustained nutrient source rather than a liquid feeding routine. The listed plant range covers annuals, perennials, roses, tomatoes, peppers, squash, lettuce, trees, and shrubs, so one granular product can serve varied garden areas. Espoma recommends spring and fall use on trees and shrubs; the pack is sold as two four-pound bags. This seasonal guidance and broad application make it especially relevant to established outdoor plantings.

Skip it if you need a liquid food for immediate nutrient uptake; FoxFarm Big Bloom is a liquid fertilizer described for quick absorption.

This suits gardeners maintaining mixed flower, vegetable, tree, and shrub plantings who want slow-release granules. Follow the directions for the specific plants, since the stated spring-and-fall timing is specifically given for trees and shrubs.

Listed on Amazon as: Espoma Organic Plant-Tone 5-3-3 Natural & Organic All Purpose Plant Food; 4 lb. Bag; Organic Fertilizer for All Flowers, Vegetables, Trees, and Shrubs. Pack of 2

#5 · Large Garden Bag

5. Jobe’s Organics All Purpose Fertilizer

• Weight: 16 lb
• Form: Granules

Best for: Large organic garden applications.

Why it ranks #5: The 16-pound granular 4-4-4 formula suits broad garden use and is OMRI listed for organic gardening; directions call for applications every two to three weeks.

A 16-pound bag and 4-4-4 NPK formula make Jobe’s Organics Granular All Purpose Fertilizer suited to gardeners tending substantial mixed plantings. Its listed applications include vegetables, flowers, shrubs, trees, and plants, with directions calling for use every two to three weeks or as needed.

The granular 4-4-4 formula supplies nitrogen, phosphate, and potash, with calcium, magnesium, and sulfur also named in the ingredient information. Its 16-pound size suits repeated applications across a larger garden, while the stated interval of every two to three weeks or as needed helps establish a maintenance routine. Jobe’s says the product is OMRI listed for organic gardening and may be used in certified organic food production according to the USDA National Organic Program. The granules are also described as avoiding wasteful runoff, mess, hazards, and smells.

Skip it if you prefer a multi-month interval between granular feedings; Miracle-Gro Organic All Purpose Plant Food feeds for up to three months.

Choose this for larger mixed gardens where a sizable granular supply and frequent applications fit your maintenance routine. Its two-to-three-week guidance means it calls for more regular attention than a product with a multi-month feeding interval.

Listed on Amazon as: Jobe’s Organics Granular All Purpose Fertilizer, Easy Plant Care Fertilizer for Vegetables, Flowers, Shrubs, Trees, and Plants, 16 lbs Bag

#6

6. Dr. Earth Organic 5

• Weight: 4 lb
• Form: Granules

Best for: Organic vegetable garden growers.

Why it ranks #6: This granular fertilizer is tailored to tomatoes, vegetables, and herbs, feeds for several months, and includes beneficial soil microbes and mycorrhizae.

Beneficial soil microbes and ecto- and endo-mycorrhizae distinguish Dr. Earth Organic 5, giving vegetable gardeners a microbial blend alongside plant nutrients. Its granules feed for several months, making it a practical option for garden beds, raised beds, containers, and planting rather than a fertilizer limited to one growing setup.

The formula provides primary plant nutrients and seven champion strains of beneficial soil microbes, plus ecto- and endo-mycorrhizae; that combination suits gardeners seeking both nutrient input and soil biology support. Granules feed for several months, so one application can carry a planting through an extended period. The product is listed for vegetable gardens, raised beds, containers, native backyard soil, and compost tea. Its 100% natural and organic ingredients contain no GMOs, chicken manure, or sewage sludge.

Skip it if you need a single all-purpose food for indoor and outdoor plants; Organic Plant Magic serves houseplants as well as gardens.

Choose this for an organic vegetable garden, raised bed, or container planting when a granular feed with soil microbes suits your routine. Its listed focus is vegetables, herbs, and garden crops, so it is less tailored to general indoor feeding.

Listed on Amazon as: Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag

#7

7. Miracle-Gro Organic All Purpose Plant Food

• Weight: 3.1 lb
• Form: Granules

Best for: Measured granular outdoor feeding.

Why it ranks #7: The granular all-purpose food feeds outdoor vegetables and flowers for up to three months, with stated coverage and a one-tablespoon pot dose.

Clear application measures make Miracle-Gro Organic All Purpose Plant Food practical for gardeners feeding both ground beds and containers. The directions give separate coverage guidance for in-ground soil and a six-inch pot, while the granules feed plants for up to three months after watering starts.

For garden soil, the instructions call for shaking granules evenly over the surface and mixing them into the top one to three inches; for potted plants, mix throughout the soil. Watering starts the feeding, and the stated coverage is about three-quarters to one cup per 20 square feet or one tablespoon for a six-inch pot. Feeding can last up to three months. This makes the product straightforward to portion across outdoor vegetables and flowers, provided users follow the different soil-preparation steps.

Skip it if you want a liquid concentrate mixed into watering instead of soil-preparation steps; Grow Queen Organic Liquid Indoor Plant Food is a liquid option.

This fits outdoor gardeners who want measured granular feeding for beds and pots, with a stated duration of up to three months. Account for the soil-mixing step, especially when applying it across established garden areas.

Listed on Amazon as: Miracle-Gro Organic All Purpose Plant Food, 3 lb.

#8

8. Grow Queen Indoor Plant Food

• Weight: 0.36 kg
• Form: Liquid

Best for: Balanced indoor plant watering.

Why it ranks #8: Its 5-5-5 liquid formula is specifically aimed at indoor plants, houseplants, and tropicals; the 8-ounce bottle is stated to treat up to 50 gallons.

An equal 5-5-5 nutrient balance makes Grow Queen Organic Liquid Indoor Plant Food a straightforward match for houseplants and tropicals. Its concentrated formula treats up to 50 gallons from an eight-ounce bottle, and the directions connect feeding to routine watering with about one capful per gallon.

The balanced nitrogen, phosphorus, and potassium formula is specified for indoor plants, houseplants, and tropicals, so it targets potted indoor collections rather than a general food-crop routine. The directions call for about four milliliters per gallon of water, letting users incorporate the liquid into watering. Eight ounces treats up to 50 gallons, which stretches the concentrate across many feedings. The listing says it can be used at every watering without burn, but explicitly says not to apply it to crops intended for human or animal consumption.

Skip it if you feed vegetables or other food crops; Dr. Earth Organic 5 is listed for vegetable gardens, raised beds, and containers.

This is a fit for indoor plant keepers who want a concentrated, balanced liquid added to watering. Its indoor focus and restriction against use on food crops make it a poor match for gardeners feeding edible plants.

Listed on Amazon as: Organic Liquid Indoor Plant Food, Houseplant, Tropical & All-Purpose Indoor Plant Fertilizer, Organic Liquid Fertilizer 5-5-5 with Sea Kelp, 8oz Treats 50 Gallons

#9

9. FoxFarm Big Bloom

• Weight: 16 oz
• Form: Liquid

Best for: Liquid support for flowering plants.

Why it ranks #9: The liquid formula supports flowering and fruiting plants with earthworm castings and bat guano, but its 0-0.5-0.7 NPK is less broadly balanced.

Earthworm castings and bat guano form the natural nutrient blend in FoxFarm Big Bloom, a liquid food for gardeners tending flowering and fruiting plants. Its quick-absorption description and stated support through every growth stage make it an option when liquid feeding is preferred.

As a liquid fertilizer, Big Bloom is described as enabling immediate nutrient uptake, which suits growers seeking nutrients plants can access quickly. Earthworm castings and bat guano supply its natural nutrient blend, while the product is presented for support during every stage of growth and for flowering and fruiting plants. The 0-0.5-0.7 NPK specification identifies its nutrient profile. Because it contains phosphorus, the safety information cautions that runoff can threaten water quality and some states restrict phosphorus fertilizers on non-agricultural lawns or turf.

Skip it if you need a granular all-purpose feed for vegetables and shrubs; Espoma Plant-Tone covers those plantings in granular form.

Choose Big Bloom if you want a liquid blend of earthworm castings and bat guano for flowering or fruiting plants across growth stages. Its phosphorus content makes runoff rules an important boundary, particularly for lawn or turf use.

Listed on Amazon as: Fox Farm Big Bloom Liquid Plant Food – Organic Bloom Fertilizer for Flowering & Fruiting Plants, Contains Earthworm Castings & Bat Guano – Supports All Stages of Plant Growth – 0-0.5-0.7 NPK, 1 Pint

#10

10. Farmer’s Secret Fruit & Bloom Booster

• Weight: 1.4 lb
• Form: Liquid

Best for: Fruit and bloom booster.

Why it ranks #10: This concentrated liquid targets fruit and bloom production rather than general plant feeding; its high phosphorus and potassium focus narrows its use case.

High phosphorus and potassium make Farmer’s Secret Fruit & Bloom Booster a targeted choice for gardeners seeking support for fruit and flower production. The concentrated liquid is intended for fruit-, vegetable-, and flower-producing plants, with directions to dilute it and repeat applications every two to four weeks.

The product’s high phosphorus concentration is described as encouraging healthy root development, while phosphorus and potassium are identified as macronutrients critical to bloom and fruit production. That focus suits flowering and fruiting plants, including the listed examples of citrus, avocados, raspberries, cantaloupe, roses, and petunias. Users dilute it with water and pour or spray it alongside regular watering, repeating every two to four weeks. The routine fits gardeners able to measure and mix a liquid booster rather than apply dry granules.

Skip it if you want a slow-release granular feed across mixed beds; Espoma Plant-Tone provides a long-lasting granular nutrient reservoir.

Choose this concentrated liquid for fruiting and flowering plants when a targeted nutrient profile and recurring diluted applications suit your routine. It is less appropriate when you want one slow-release, all-purpose granular feed for a mixed garden.

Listed on Amazon as: Farmer’s Secret Fruit & Bloom Booster Fertilizer – Super Concentrated – Boosts Flowering and Yield on All Varieties of Fruits, Vegetables and Flowers (16oz)