Best Bat Guano For Plants: Compare 10 Fertilizers

#1 · Best Overall

1. Down to Earth Bat Guano 7-3-1

• Form: Powder
• Weight: 4.64 oz

Best for: Nitrogen-focused vegetative feeding.

Why it ranks #1: Its 7-3-1 powder is OMRI-listed for organic production and supplies readily available nitrogen for vigorous vegetative growth and early flowering.

A 7-3-1 formula with nearly one-third of its nitrogen water soluble gives this Down To Earth bat guano a clear role in vegetative feeding. That readily available nitrogen supports vigorous growth, while the listed phosphorus and micronutrients contribute broader plant nutrition. Its OMRI listing also makes it an option for organic production.

The powder contains 100% sun-dried bat guano with no additives or fillers, so its ingredient list is straightforward for gardeners choosing a natural soil amendment. The 7-3-1 analysis and readily available nitrogen suit a growth-focused routine, while the product is also described for early fruit and flower development. At 0.25 pound, it is a small quantity for limited applications; protective clothing and careful handling are advised.

Skip it if you need a larger quantity for repeated feeding; Down To Earth Organic Bat Guano 25lb offers the same 7-3-1 formula in a larger listed size.

Choose this small-quantity powder for a limited group of plants needing nitrogen support during vegetative growth or early development. Its organic-production listing is useful, but the 0.25-pound amount may not suit a broad garden.

Listed on Amazon as: Down to Earth All Natural Fertilizers Organic Bat Guano – High Nitrogen Plant Food for Vegetative Growth 7-3-1, 0.25 lb

#2 · Best Soluble Powder

2. Roots Organics Nitro Water Soluble

• Form: Powder

Best for: Water-soluble vegetable feeding.

Why it ranks #2: The 9-3-1 powder is described as water soluble for soil drenching, foliar feeding, or top dressing, with nitrogen for vegetative growth.

A water-soluble 9-3-1 powder lets Roots Organics Nitro Bat Guano move between soil drenching, foliar feeding, and top dressing. Its concentrated nitrogen boost is paired with phosphate, potassium, and calcium, offering vegetables, herbs, and flowering plants a broader listed nutrient mix.

The finely sifted powder is described as mixing easily and dissolving cleanly, which supports use in several feeding workflows: soil drenching, foliar feeding, or top dressing. Its 9-3-1 ratio centers nitrogen while also supplying phosphate, potassium, and calcium. The product is presented for vegetables, herbs, flowers, tomatoes, and indoor plants, so it can serve varied plantings. Its water-soluble format means growers should be comfortable preparing a liquid application for some uses.

Skip it if you prefer granules for dry application without dissolving powder; Roots Organics Nitro Bat Guano Fertilizer 9-Pound is listed in granule form.

Choose this powder if you want a 9-3-1 feed that can be applied through several methods to vegetables, herbs, or flowers. Its soluble format suits growers willing to mix it for liquid feeding.

Listed on Amazon as: Roots Organics Nitro Bat Guano Water Soluble Fertilizer, 9-3-1 NPK, 3 Lb

#3 · Best Bloom Blend

3. FoxFarm Happy Frog Cavern Culture

• Form: Powder
• Weight: 3 lb

Best for: Bud and bloom development.

Why it ranks #3: Its 1-12-0 blend combines bat guano, seabird guano, and rock phosphate, with a stated focus on bud and flower development.

A blend of bat guano, seabird guano, and rock phosphate gives FoxFarm Happy Frog Cavern Culture a bloom-centered 1-12-0 formula. The product is specifically presented for bud and flower development, making it a fit for gardeners prioritizing flowering plants and fruiting crops rather than a nitrogen-led vegetative feed.

The blend combines three named ingredients—bat guano, seabird guano, and rock phosphate—with a 1-12-0 analysis. That composition and the stated focus on multiple buds and flowers give the product a specific role during bloom development. FoxFarm also says it encourages flavorful fruits and vegetables, extending its use to harvest-focused gardens. It is a soil-applied powder, so it fits soil routines rather than hydroponic feeding.

Skip it if you want a nitrogen-led vegetative feed; Down To Earth All Natural Fertilizers 7-3-1 Bat Guano is listed for vigorous vegetative growth.

Pick this powder for soil-grown plants when bud and flower development is the priority, including fruit and vegetable crops. Its 1-12-0 profile is a poor match for gardeners seeking a nitrogen-forward vegetative formula.

Listed on Amazon as: FoxFarm Happy Frog Cavern Culture Bat Guano Fertilizer – 1-12-0 Blend of Rock Phosphate, Seabird Guano for Bud and Flower Development – Encourages Delicious Tasting Fruits & Vegetables – 4 lb

#4 · Best Hydroponic Liquid

4. Budswel Liquid Guano

• Form: Liquid

Best for: Soil and hydroponic bloom feeding.

Why it ranks #4: This liquid combines bat and seabird guano with earthworm castings and is specified for soil or hydroponic use in flowering and fruiting plants.

Compatibility with both soil and hydroponic applications is the defining advantage of Budswel, a liquid nutrient solution made from bat and seabird guano plus earthworm castings. Its high-phosphorus blend targets strong, multiple blooms in fruiting and flowering plants, giving growers across those two systems a shared option.

Budswel's liquid form suits growers who want a nutrient solution for either soil or hydroponic applications, rather than a product limited to one of those settings. The high-phosphorus mix pairs bat guano and seabird guano with earthworm castings, supporting its stated use for strong, multiple blooms. It uses all-organic materials with no synthetics. Settling may occur, and phosphorus fertilizer use can be restricted on some non-agricultural lawns or turf.

Skip it if you need a powder or granule for dry soil application; FoxFarm Happy Frog Cavern Culture is a soil-applied powder for bloom development.

Choose Budswel if you grow flowering or fruiting plants in soil or hydroponics and want an all-organic liquid blend. Check local rules before applying its phosphorus-containing formula to lawn or turf.

Listed on Amazon as: Hydrofarm GUBS128C Super Bat Budswel Organic Hydroponic Liquid Nutrient Solution for Strong Blooms in Garden Soil, Flowers and Plants, 1 Gallon

#5

5. Dr. Earth Pure & Natural Guano

• Form: Liquid
• Weight: 0.68 kg

Best for: Measured feeding for container plants.

Why it ranks #5: Its 7-3-1 formula suits nitrogen-forward feeding, and the listing says a 1.5-pound bag feeds twelve five-gallon plants for up to two months.

A stated feeding reach of 12 five-gallon plants gives Dr. Earth Pure & Natural Bat Guano a practical scale for container gardeners. Its 7-3-1 analysis and feed duration of up to two months provide a defined nutrient profile and interval for planning plant care.

Dr. Earth lists this product as natural and organic, with a 7-3-1 NPK analysis and enough to feed 12 five-gallon plants. The stated feeding duration of up to two months gives container growers a planning reference between applications. It is made in the USA from sustainable ingredients. The product details also advise keeping it away from children and pets and using gloves, so handling and storage remain part of the routine.

Skip it if you want a soluble 9-3-1 powder for soil drenching or foliar feeding; Roots Organics Nitro Bat Guano Water Soluble Fertilizer lists those application methods.

This is a practical option for container growers who want a 7-3-1 feed with a stated plant count and duration. Keep its up-to-two-month feeding window and handling precautions in mind.

Listed on Amazon as: Dr. Earth Pure & Natural Bat Guano 1.5 lb

#6

6. Roots Organics Nitro Bat Guano 3 lb

• Form: Powder
• Weight: 3 lb

Best for: Sifted nitrogen-source powder.

Why it ranks #6: The three-pound powder is described as a nitrogen, phosphate, and calcium source, carefully processed and sifted for easier handling.

Careful processing and sifting are the key practical features of Roots Organics Nitro Bat Guano: the powder is described as easier to work with while supplying nitrogen, phosphate, and calcium. Its stated fast action and support for vigorous growth make it a fit for gardeners seeking a growth-oriented guano.

This Roots Organics product is a powder, and its supplied description says it is carefully processed and sifted to make handling easier. It is also identified as a source of nitrogen, phosphate, and calcium, tying its nutrient contribution to the stated goal of vigorous growth. The description calls it fast acting for quick results. The listed details do not provide an NPK ratio or application directions, so buyers wanting either specific detail should choose accordingly.

Skip it if you need a listed NPK ratio or application method before buying; Down To Earth All Natural Fertilizers 7-3-1 Bat Guano provides an analysis.

Consider this powder if you want a sifted guano source of nitrogen, phosphate, and calcium for vigorous growth. It is less suitable when a published NPK ratio or specific application directions are essential.

Listed on Amazon as: Roots Organics Nitro Bat Guano, 3 lbs

#7

7. Greenbelt Organics Bat Guano

• Form: Powder
• Weight: 2 lb

Best for: Flexible soil amendment methods.

Why it ranks #7: This two-pound powder is presented as an all-purpose fertilizer and can be mixed into potting media, side-dressed, or steeped as tea.

Mixing into potting medium, side dressing, steeping as tea, or using as a foliar spray gives Greenbelt Organics Bat Guano several application routes. The all-purpose organic fertilizer is also described as a bloom and flavor enhancer, making it adaptable to different garden routines rather than tied to one stated method.

The product's directions name four workflows: blend it into potting mediums, apply it as a side dress, steep it to make tea, or prepare a foliar spray. That flexibility can help gardeners work it into existing soil or feeding routines. Greenbelt also describes the powder as building and cleaning soil with beneficial microorganisms, and as biodegradable. Wear gloves during handling and store it in a cool, dry place away from children and pets.

Skip it if you need a stated nutrient ratio to select a formula; Down To Earth All Natural Fertilizers 7-3-1 Bat Guano lists its NPK analysis.

This powder suits gardeners who value several application methods and want an all-purpose organic soil amendment. Choose a product with a stated NPK ratio instead if nutrient analysis is central to your feeding plan.

Listed on Amazon as: Bat Guano Fertilizer

#8 · Largest Listed Bag

8. Roots Organics Nitro Bat Guano 9 lb

• Form: Granules
• Weight: 9 lb

Best for: Larger granule supply.

Why it ranks #8: The nine-pound granule listing identifies nitrogen, phosphorus, and calcium and describes the product as fast acting for vigorous growth.

A 9-pound granule quantity sets this Roots Organics Nitro Bat Guano apart for gardeners handling more than a small planting area. The product supplies nitrogen, phosphorus, and calcium, and its carefully processed, sifted material is described as easier to work with while supporting vigorous, fast growth.

The granule form gives this product a different handling format from the powder versions in the lineup, while the 9-pound quantity serves larger feeding needs. Roots Organics identifies nitrogen, phosphorus, and calcium as key nutrients and says the guano is carefully processed and sifted for easier use. The description also notes bat-friendly harvesting methods. No NPK ratio or specific application schedule is supplied in the provided details, so those remain important selection considerations.

Skip it if you need a stated NPK analysis for precise nutrient planning; Roots Organics Nitro Bat Guano Water Soluble Fertilizer lists a 9-3-1 ratio.

Choose this granule product for a larger planting area when nitrogen, phosphorus, and calcium are priorities. Its listed details do not provide an NPK ratio or feeding schedule, so factor that into your routine.

Listed on Amazon as: Roots Organics Nitro Bat Guano Fertilizer, 9-Pound

#9

9. Magic Guano Granulate

• Form: Granules
• Weight: 16 oz

Best for: Small-garden granular feeding.

Why it ranks #9: Its one-pound granules are aimed at orchids, shrubs, and vegetables, but the listing provides no NPK ratio to compare nutrient balance.

A fine-grade granulate with a tablespoon-per-plant application direction gives Magic Guano a straightforward dosing approach for home gardens. The product is described for orchids, shrubs, and vegetables, with claimed support for root development, foliage, blooms, and fruit or vegetable yields.

The granulated form and specific tablespoon-per-plant direction provide a simple way to portion this fertilizer across individual plants. Its listed uses span orchids, shrubs, and home garden vegetables, while the product description connects soil enrichment with root development, lush foliage, and abundant blooms. It is identified as 100% organic guano. The provided details do not give an NPK analysis, so gardeners who select fertilizer by nutrient ratio will need another option.

Skip it if you require an NPK ratio for nutrient planning; Down To Earth All Natural Fertilizers 7-3-1 Bat Guano supplies a listed analysis.

This granulate fits home gardeners who want a measured application for orchids, shrubs, or vegetables. If you need to match a specific nutrient ratio, its product details do not provide an NPK analysis.

Listed on Amazon as: Magic Guano Fertilizer, 100% Organic Bat Guano Granulate, 1lb Bag

#10

10. Down to Earth 25 lb Guano

• Form: Liquid
• Weight: 16 oz

Best for: Organic 7-3-1 garden feeding.

Why it ranks #10: The listing describes a 7-3-1 formula and OMRI status, but its specifications conflict with the title on package size and item form.

An OMRI listing for organic production paired with a 7-3-1 formula makes Down To Earth Bat Guano a fit for gardeners seeking a defined, organic-listed fertilizer. Its readily available nitrogen and micronutrients are described as supporting vigorous vegetative growth and early fruit and flower development.

This Down To Earth blend provides nitrogen, phosphorus, and micronutrients, with nearly one-third of its nitrogen water soluble and described as readily available to plants. That supports its stated role in vigorous vegetative growth and early fruit and flower development. The product is also described as fast acting when mixed into soil. Its supplied safety information calls for protective clothing, gloves, and eyewear during handling and application, so plan for careful use.

Skip it if you need a soluble powder specifically listed for foliar feeding; Roots Organics Nitro Bat Guano Water Soluble Fertilizer lists foliar application.

Choose this formula if you want a 7-3-1 guano for vegetative growth and early reproductive development in an organic-production context. Follow the listed protective handling precautions during mixing and application.

Listed on Amazon as: Ernst Grain's Down to Earth Organic Bat Guano Fertilizer Mix 7-3-1, 25lb