---
title: "Worm Castings — $2.0M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/worm-castings"
last_updated: "2026-07-21T19:50:26.620Z"
locale: en
meta:
description: "Niche score 62/100 · $2.0M/yr market · 959K searches/yr · $22.07 avg price. Clears our launch bar. Data updated Jul 2026."
"og:description": "Niche score 62/100 · $2.0M/yr market · 959K searches/yr · $22.07 avg price. Clears our launch bar. Data updated Jul 2026."
"og:title": "Worm Castings — $2.0M/yr Amazon US Niche (2026) - Flapen"
---
# **worm castings**
**Launch it**
A $2.0M/yr market growing +8.3% this quarter with returns at 0.2% — clears our launch bar.
Market size 94Growth 35Conversion 84Competition 51Returns 99Price range 85Avg price 93Brand share 37Review moat 46Quality gap 19
**Returns**
**Incredible****0.2%**
return rate — above 6% kills the launch gate
**Market size**
**Great****$2.0M**
$2.0M/yr · 959K searches
**Avg price**
**Great****$22.07**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$7.50–$67.40**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****9.2%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Good****54%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Okay****1,935.96**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Growth**
**Okay****+8.3%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, worm castings is a $2.0M/yr Amazon United States market (959K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Mar–Apr–May. Verdict: Launch it — 62/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **worm castings market data**
- **Units sold / yr**
- **80K–100K**
- avg 4,000–5,000/product
- **Revenue / yr**
- **$1.8M–$2.2M**
- units × avg price
- **Launch success**
- **—**
- 1 of 1 new (360d)
- **Conversion rate**
- **9.2%**
- **Avg BSR**
- **#479**
- **Page quality**
- **0%**
- **Prime**
- **67%**
- **Sponsored**
- **89%**
- **Out of stock**
- **4.9%**
- **Avg brand age**
- **65 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▲rising
**Sellers**
**35**
**Top-5 brand share**
**83%**
Top 20: 97%
**Top-5 click share**
**54%**
Top 20: 92%
**Open market**
**14%**
- Wiggle Worm28% - BRUT WORM FARMS27% - plantonix13% - Back to the Roots10% - Earth Science5% - --3% - Open — no brand owns it (8 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +8.3% search growth over the last 90 days.
30K20KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Mar, Apr, May · busiest ÷ quietest = 3.3×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/worm-castings/trend)
## **Top worm castings search terms**
- **worm castings**490K/yr+3.4%9.3% conv. - **worm castings for gardening**82K/yr+75.8%10.6% conv. - **earthworm castings**75K/yr+26.9%7.9% conv. - **worm castings for plants**105K/yr-48.2%8.6% conv. - **humus de lombriz para plantas**38K/yr+36.0%3.2% conv. - **worm casting**36K/yr-0.1%6.9% conv. - **wiggle worm castings**14K/yr+34.4%9.1% conv. - **worm castings organic fertilizer**16K/yr+11.1%8.7% conv. - **organic worm castings**15K/yr+1.9%8.7% conv. - **humus de lombriz**13K/yr+29.0%2.7% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/worm-castings/search-terms)
## **Top worm castings products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$98K10%$195K15%$293K20%$391K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 27 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Brut Organic Worm Castings for Plants 5 LB Natural Nutrients Fertility Builder Plant Food for Potting Soil and Garden Soil Indoor and Outdoor Use**BRUT WORM FARMS**$15.44**4.8★5,828 rev](https://www.amazon.com/dp/B08SGDB67D) [2**Wiggle Worm 100% Pure Organic Mineral-Dense Worm Castings Fertilizer 30lbs - Improves Soil Fertility and Aeration for Growing Better Houseplants Vegetables and More**Wiggle Worm**$34.24**4.8★1,817 rev](https://www.amazon.com/dp/B0CV5ZZJF1) [3**Back to the Roots Organic Worm Castings for Plants Natural Fertilizer and Soil Enhancer for Gardening Made in the USA 5lb**Back to the Roots**$14.87**4.8★906 rev](https://www.amazon.com/dp/B0CQNHT6SM) [4**Wiggle Worm 100% Pure Worm Castings Plus Worm Egg Material 40lbs - Fertilizer and Soil Amendment for Indoor and Outdoor Gardening to Improve Soil Fertility and Aeration - 100% Organic and Odor Free**Wiggle Worm**$41.54**4.6★984 rev](https://www.amazon.com/dp/B0BYJYCSM2) [5**Brut Organic Worm Castings for Plants 12 LB Natural Nutrients Fertility Builder Plant Food for Potting Soil and Garden Soil Indoor and Outdoor Use**BRUT WORM FARMS**$24.11**4.8★5,828 rev](https://www.amazon.com/dp/B08SG88JBR)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Wrigglebrew Organic Liquid Fertilizer Concentrate from Worm Castings. Non-toxic All-Purpose Plant Food for Gardens Vegetables Fruits Houseplants Seed Starters and Ornamentals. (16 Fluid Ounces)**WriggleBrew**$10.00**174 rev12mo ago](https://www.amazon.com/dp/B0FJ3LZJ7F) [**Earth Science RevitaSoil 4lb Up to 16 Sq. Ft. - Premium Organic Soil Revitalizer - Natural Nutrients & Earthworm Castings Grow Up to 3X More Indoor & Outdoor Plants Vegetables Flowers Gardens**Earth Science**$23.72**108 rev1y ago](https://www.amazon.com/dp/B0F67D5ZW5) [**Worm Castings for Plants 1 QT (1.5lbs). Organic Soil Rebuilder and Plant Fertilizer.**Happy Bunny Farms**$11.62**40 rev1y ago](https://www.amazon.com/dp/B0DC8B4VC1) [**Worm Casting Tea Concentrate Liquid Microbial Supplement for Living Soil Stronger Roots & Healthier Plants 8 oz**TPS NUTRIENTS**$11.61**64 rev2y ago](https://www.amazon.com/dp/B0D4JH5DR2) [**Back to the Roots Organic Worm Castings for Plants Natural Fertilizer and Soil Enhancer for Gardening Made in the USA 5lb**Back to the Roots**$14.87**906 rev2y ago](https://www.amazon.com/dp/B0CQNHT6SM)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Earth Science Earthworm Castings Premium Plant Fertilizer for Indoor & Outdoor Plants Soil Enhancer for Vegetable Gardens 4lb**Earth Science**$7.50**4.8★**▲ 183%**](https://www.amazon.com/dp/B09123B19R) [**Arcadia Garden Products Worm Nerd Worm Castings Natural Soil Additive for Lawns Gardening and Potted Plants 3 Quarts Black (WN05) -Cannot Ship to Hawaii-**Arcadia Garden Products**$10.75**4.7★**▲ 179%**](https://www.amazon.com/dp/B09HSLMM6Z) [**20 oz 100% Organic Worm Castings Natural Superfood for Plant Growth Root Development & Growing Healthier Stronger Crops Non Toxic & Kind to Soil Resealable Zip Pouch Life Cycle Organics**Life Cycle Organics**$10.33**4.8★**▲ 115%**](https://www.amazon.com/dp/B09FFPR5PF) [**Worm Casting Tea Concentrate Liquid Microbial Supplement for Living Soil Stronger Roots & Healthier Plants 8 oz**TPS NUTRIENTS**$11.61**4.5★**▲ 93%**](https://www.amazon.com/dp/B0D4JH5DR2) [**Earth Science RevitaSoil 4lb Up to 16 Sq. Ft. - Premium Organic Soil Revitalizer - Natural Nutrients & Earthworm Castings Grow Up to 3X More Indoor & Outdoor Plants Vegetables Flowers Gardens**Earth Science**$23.72**4.4★**▲ 77%**](https://www.amazon.com/dp/B0F67D5ZW5)
**~~View all trending →~~**
## **What buyers say about worm castings**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**42%
*“grow so very well”*
**Quality-Overall**27%
*“Amazing quality”*
**Value For Money**7%
*“Worth it”*
**Advertised Vs Actual Product**5%
*“As advertised”*
**Smell**3%
*“It's odor free”*
**Ease Of Use**3%
*“Easy to use”*
**Pest/Insect Control**2%
*“does make a difference with plants add I have found it keeps away white flies”*
**Moist/Dry**1%
*“help keep it moist”*
**Size-Overall**1%
*“Great quantity, and size for the price”*
**Strength**1%
*“Makes things grow faster, bigger and stronger”*
### **What buyers complain about **
**Quality-Overall**13%
*“Poor quality control, apparently”*
**Value For Money**12%
*“Not an incredible value”*
**Plant Growth**12%
*“My vegetables last year grew crazy”*
**Size-Overall**12%
*“bag is small”*
**Smell**8%
*“The smell is a bit strong”*
**Moist/Dry**4%
*“Worse ever dry & crumbly”*
**Functionality-Overall**4%
*“bers does not work”*
**Wood Quality**4%
*“Has rocks and wood chippings”*
**Leak-Proof**3%
*“The bag was leaking”*
**Contamination**3%
*“Try not to think about it, and feed this and that Alaskan fish emulsion and other nasty things”*
### **Top return reasons **
**Value For Money**32%
**Size-Overall**26%
**Leak-Proof**11%
**Smell**8%
**Advertised Vs Actual Product**7%
**Functionality-Overall**3%
**Plant Growth**3%
**Defective Material/Parts**2%
**Contamination**2%
**Quality-Overall**2%
## **Common questions**
- **Is worm castings profitable to sell on Amazon United States?**
- The niche generates $2.0M/yr across 27 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +8.3%. Flapen's verdict: Launch it (62/100).
- **How competitive is the worm castings niche?**
- 14 brands and 35 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in worm castings?**
- Top complaints mined from reviews: Quality-Overall, Value For Money, Plant Growth. The return rate is 0.2%.
- **When does demand for worm castings peak?**
- Demand peaks in Mar–Apr–May; the busiest month runs 3.3× the quietest.
- **What does it cost to enter the worm castings niche?**
- Listings span $7.50–$67.40; the average listing price is $22.07 (sweet spot $15–$100). The average incumbent carries 1,936 reviews — the moat a new listing must climb.
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