---
title: "Worm Castings — £29K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/home-garden/worm-castings"
last_updated: "2026-07-31T12:12:05.418Z"
locale: en
meta:
description: "Niche score 40/100 · £29K/yr market · 56K searches/yr · £9.33 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 40/100 · £29K/yr market · 56K searches/yr · £9.33 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Worm Castings — £29K/yr Amazon UK Niche (2026) - Flapen"
---
# **worm castings**
**Skip it**
A small market ($29K/yr) — this niche doesn't clear our bar today.
Market size 7Growth 27Conversion 64Competition 28Returns 99Price range 13Avg price 28Brand share 21Review moat 88Quality gap 55
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****235.29**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Good****5.6%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****£9.33**
avg listing price — sweet spot $15–$100
**Growth**
**Okay****+1.9%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****92%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****£4.94–£16.48**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Bad****£29K**
£29K/yr · 56K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=uk&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United Kingdom niche tracking, worm castings is a £29K/yr Amazon United Kingdom market (56K searches/yr). The top 5 brands hold 92% of demand. Demand peaks in Mar–Apr–May. Verdict: Skip it — 40/100.
Data updated Jul 26, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **worm castings market data**
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **£23K–£28K**
- units × avg price
- **Conversion rate**
- **5.6%**
- **Avg BSR**
- **#314**
- **Page quality**
- **0%**
- **Prime**
- **64%**
- **Sponsored**
- **64%**
- **Out of stock**
- **7.7%**
- **Avg brand age**
- **58 months**
- **Avg seller age**
- **192 days**
## **Competition & brand share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **—flat
**Sellers**
**7**
**Top-5 brand share**
**92%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**3%**
- Growcery32% - Baltic Worm23% - Invigortex21% - Generic10% - R&R SHOP6% - Elixir Gardens5% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 64 weeks — +1.9% search growth over the last 90 days.
2K1KSpike '26 seasonMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Mar, Apr, May · busiest ÷ quietest = 3.1×
[**Open Trend **](https://flapen.com/research/uk/home-garden/worm-castings/trend)
## **Top worm castings search terms**
- **worm castings**42K/yr-1.1%4.3% conv. - **worm castings for plants**11K/yr+3.9%4.4% conv. - **vermicompost**3K/yr+38.1%0.9% conv. [**All search terms **](https://flapen.com/research/uk/home-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%10%£3K20%£6K30%£9K40%£12K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 14 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Growcery Worm Castings - Premium Fertiliser for Plants Superior Soil Improver UK and Rich Vermicompost for Enhanced Plant Health and Vigour Fertiliser for plants outdoor and indoor (1L)**Growcery**£6.68**4.6★96 rev](https://www.amazon.co.uk/dp/B0D2NXDXSJ) [2**Black Gold Worm Castings 100% Organic Microbe-Rich Fertiliser Improves Soil Retains Moisture & Boosts Growth For Houseplants Gardens & Lawns (5 Litre)**Invigortex**£11.93**4.1★43 rev](https://www.amazon.co.uk/dp/B0FQCV6K9V) [3**Worm Castings Pure Natural Multipurpose Fertilizer for Indoor and Outdoor Plants Vermicompost TopSoil Builder Improver Plant & Root Growth Feed Fertiliser for Potting Germination NPK Nutrient**Baltic Worm**£10.63**4.5★463 rev](https://www.amazon.co.uk/dp/B08SKKL9YZ) [4**Baltic Worm Worm Castings 5 Liter - Pure Multipurpose Fertiliser Vermicompost - Natural Top Soil Builder and Improver Plant Feed for Potting Germination Growing**Baltic Worm**£16.48**4.6★1,245 rev](https://www.amazon.co.uk/dp/B06ZZXBGZV) [5**Plantalaya Worm Castings Organic Soil Booster & Natural Plant Food Premium Earthworm Casting Nutrient Rich Soil Improver (0.5 Litre)**Generic**£5.86**4.2★3 rev](https://www.amazon.co.uk/dp/B0GZSG25D6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Plantalaya Worm Castings Organic Soil Booster & Natural Plant Food Premium Earthworm Casting Nutrient Rich Soil Improver (0.5 Litre)**Generic**£5.86**3 rev2mo ago](https://www.amazon.co.uk/dp/B0GZSG25D6) [**Growcery Living Soil Mix with Mycorrhizal Fungi Worm Castings & Activated Biochar Bioactive Potting Soil for Houseplants & Garden Plants (1L)**Growcery**£6.62**38 rev4mo ago](https://www.amazon.co.uk/dp/B0GT1V5H89) [**Black Gold Worm Castings Bucket | 100% Worm Castings for Mixing or Topdressing | Pots Gardens & Raised Beds | Supports Microbial Activity & Root Health (10L)**Invigortex**£13.29**11 rev9mo ago](https://www.amazon.co.uk/dp/B0FWCPQYS8) [**Black Gold Worm Castings 100% Organic Microbe-Rich Fertiliser Improves Soil Retains Moisture & Boosts Growth For Houseplants Gardens & Lawns (5 Litre)**Invigortex**£11.93**43 rev10mo ago](https://www.amazon.co.uk/dp/B0FQCV6K9V) [**Growcery Worm Castings - Premium Fertiliser for Plants Superior Soil Improver UK and Rich Vermicompost for Enhanced Plant Health and Vigour Fertiliser for plants outdoor and indoor (1L)**Growcery**£6.68**96 rev2y ago](https://www.amazon.co.uk/dp/B0D2NXDXSJ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Plantalaya Worm Castings Organic Soil Booster & Natural Plant Food Premium Earthworm Casting Nutrient Rich Soil Improver (0.5 Litre)**Generic**£5.86**4.2★**▲ 190%**](https://www.amazon.co.uk/dp/B0GZSG25D6) [**Elixir Gardens | 100% Organic Worm Castings Vermi Compost/Fertiliser/Soil Improver | 2 Litres - 400 Litres Available | 6ltr Bag**Elixir Gardens**£8.20**4.5★**▲ 182%**](https://www.amazon.co.uk/dp/B01BMO3Y9Q) [**Growcery Living Soil Mix with Mycorrhizal Fungi Worm Castings & Activated Biochar Bioactive Potting Soil for Houseplants & Garden Plants (1L)**Growcery**£6.62**4.3★**▲ 81%**](https://www.amazon.co.uk/dp/B0GT1V5H89) [**Baltic Worm Worm Castings 5 Liter - Pure Multipurpose Fertiliser Vermicompost - Natural Top Soil Builder and Improver Plant Feed for Potting Germination Growing**Baltic Worm**£16.48**4.6★**▲ 41%**](https://www.amazon.co.uk/dp/B06ZZXBGZV) [**Black Gold Worm Castings 100% Organic Microbe-Rich Fertiliser Improves Soil Retains Moisture & Boosts Growth For Houseplants Gardens & Lawns (5 Litre)**Invigortex**£11.93**4.1★**▲ 31%**](https://www.amazon.co.uk/dp/B0FQCV6K9V)
**~~View all trending →~~**
## **What buyers say about worm castings**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**49%
*“good quality”*
**Plant Growth**31%
*“They are growing healthy”*
**Value For Money**7%
*“Good value for money”*
**Advertised Vs Actual Product**4%
*“does the job”*
**Smell**2%
*“Something really good is that doesn't smell compare with other similar products”*
### **What buyers complain about **
**Size-Overall**36%
*“Its to small”*
**Value For Money**21%
*“Expensive”*
**Ease Of Use**14%
*“It was too stressful to deal with it so I just threw away the leftover after a couple of use”*
**Quality-Overall**14%
*“yellow balls rubbish quality”*
### **Top return reasons **
**Value For Money**43%
**Functionality-Overall**14%
**Advertised Vs Actual Product**14%
**Size-Overall**14%
**Defective Material/Parts**14%
## **Common questions**
- **Is worm castings profitable to sell on Amazon United Kingdom?**
- The niche generates £29K/yr across 14 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is +1.9%. Flapen's verdict: Skip it (40/100).
- **How competitive is the worm castings niche?**
- 7 brands and 7 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 92% of demand.
- **What do buyers complain about in worm castings?**
- Top complaints mined from reviews: Size-Overall, Value For Money, Ease Of Use. The return rate is 0.1%.
- **When does demand for worm castings peak?**
- Demand peaks in Mar–Apr–May; the busiest month runs 3.1× the quietest.
- **What does it cost to enter the worm castings niche?**
- Listings span £4.94–£16.48; the average listing price is £9.33 (sweet spot $15–$100). The average incumbent carries 235 reviews — the moat a new listing must climb.
## **Related niches in Home & Garden**
- 79 [**mole repellent**](https://flapen.com/research/uk/home-garden/mole-repellent)£163K/yr+91.4%**Worth a look**- 80 [**sun lounger**](https://flapen.com/research/uk/home-garden/sun-lounger)£2.5M/yr+299.9%**Launch it**- 80 [**fly repellent fan**](https://flapen.com/research/uk/home-garden/fly-repellent-fan)£302K/yr>1,000%**Worth a look**- 80 [**ice maker**](https://flapen.com/research/uk/home-garden/ice-maker)£2.9M/yr+371.4%**Launch it**- 80 [**parasol base**](https://flapen.com/research/uk/home-garden/parasol-base)£1.1M/yr+904.4%**Launch it**- 80 [**air conditioner**](https://flapen.com/research/uk/home-garden/air-conditioner)£39.3M/yr>1,000%**Launch it**[**All Home & Garden niches **](https://flapen.com/research/uk/home-garden)