---
title: "Seaweed Liquid Fertilizer — £565K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/home-garden/seaweed-liquid-fertilizer"
last_updated: "2026-07-31T17:58:46.583Z"
locale: en
meta:
description: "Niche score 64/100 · £565K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 64/100 · £565K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Seaweed Liquid Fertilizer — £565K/yr Amazon UK Niche (2026) - Flapen"
---
# **seaweed liquid fertilizer**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 63Growth 91Conversion 97Competition 33Returns 100Price range 71Avg price 80Brand share 40Review moat 48Quality gap 27
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.3%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Great****+100.2%**
90-day search growth — must beat 0% to launch
**Avg price**
**Great****£17.16**
avg listing price — sweet spot $15–$100
**Price range**
**Good****£4.97–£39.76**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****£565K**
£565K/yr · 215K searches
**Review moat**
**Okay****1,733.65**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Signals**[** Trending**](https://flapen.com/research/niches?market=uk&signal=trending "Search growth > 100% (90d)")
According to Flapen's Amazon United Kingdom niche tracking, seaweed liquid fertilizer is a £565K/yr Amazon United Kingdom market (215K searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 64/100.
Data updated Jul 26, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **seaweed liquid fertilizer market data**
- **Units sold / yr**
- **30K–40K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **£515K–£686K**
- units × avg price
- **Conversion rate**
- **15.3%**
- **Avg BSR**
- **#40**
- **Page quality**
- **0%**
- **Prime**
- **80%**
- **Sponsored**
- **65%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **60 months**
- **Avg seller age**
- **174 days**
## **Competition & brand share**
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**10 **—flat
**Sellers**
**78**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**65%**
Top 20: 100%
**Open market**
**14%**
- Doff21% - envii20% - Maxicrop18% - Mifica12% - Shropshire Seaweed9% - Vitax Ltd5% - Open — no brand owns it (4 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +100.2% search growth over the last 90 days.
10K6KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 22.3×
[**Open Trend **](https://flapen.com/research/uk/home-garden/seaweed-liquid-fertilizer/trend)
## **Top seaweed liquid fertilizer search terms**
- **seaweed fertiliser**94K/yr+99.1%13.4% conv. - **liquid seaweed**30K/yr+125.6%13.9% conv. - **liquid seaweed fertiliser**21K/yr+89.9%13.3% conv. - **seaweed plant food**14K/yr+194.3%15.6% conv. - **liquid seaweed feed for plants**15K/yr+52.0%16.7% conv. - **seaweed fertilizer**12K/yr+72.5%7.0% conv. - **seaweed feed**9K/yr+78.8%14.1% conv. - **organic seaweed fertiliser**6K/yr+123.4%12.6% conv. - **sea weed fertiliser**3K/yr+82.2%11.5% conv. - **liquid seaweed for lawns**4K/yr+137.0%7.0% conv. [**All search terms **](https://flapen.com/research/uk/home-garden/seaweed-liquid-fertilizer/search-terms)
## **Top seaweed liquid fertilizer 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%£28K10%£56K15%£85K20%£113K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 20 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**envii SeaFeed Xtra Organic Seaweed Fertiliser Liquid Outdoor Plant Food Ideal for all Plants Lawns Gardens and House Plants Rich in Additional Nutrients - 1 Litre Makes up to 500L**envii**£11.41**4.6★7,292 rev](https://www.amazon.co.uk/dp/B06X1953WZ) [2**doff CONCENTRATED LIQUID SEAWEED 1L Green**Doff**£5.24**4.6★231 rev](https://www.amazon.co.uk/dp/B09TW4L7L3) [3**Maxicrop All Purpose Plant Growth Stimulant 1L - Natural Seaweed Based Liquid Biostimulant - Multivitamin Boost for All Garden Plants - Strong Roots - Healthy Growth - Builds Resilient Crops**Maxicrop**£6.44**4.5★1,029 rev](https://www.amazon.co.uk/dp/B000TAULWI) [4**ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer**Mifica**£16.30**4.5★485 rev](https://www.amazon.co.uk/dp/B093WTLRXB) [5**The Shropshire Seaweed Co. Cold-Pressed Liquid Seaweed Fertilizer - Certified Organic Plant Food & Lawn Feed - Rich in Natural Nutrients for Growth Roots & Soil Health - Sustainably Sourced 1L**Shropshire Seaweed**£12.21**4.6★1,008 rev](https://www.amazon.co.uk/dp/B0064N1GH8)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**10L Premium Liquid Seaweed Fertiliser (1:200 Concentrate) Organic Plant Feed for Stronger Roots Greener Leaves & Healthier Growth Lawn Vegetables & Flowers - Dilutes up to 2 000L.**Generic**£35.55**111 rev1y ago](https://www.amazon.co.uk/dp/B0DS8Z4Q4W) [**Pro-Kleen Organic Liquid Seaweed Fertiliser 5L - Ascophyllum Seaweed Extract for Grass Vegetables Fruit Flowers Shrubs Lawns & Trees - Concentrated Formula - Provides up to 500 Treatments**Pro-Kleen**£21.35**70 rev2y ago](https://www.amazon.co.uk/dp/B0CZXRSRVJ) [**Liquid Seaweed Fertiliser 5L Organic Plant Food for All Plants Lawns & Vegetables Boosts Growth Stronger Roots & Healthier Plants Highly Concentrated (Makes Up To 1 000L)**Generic**£25.28**111 rev2y ago](https://www.amazon.co.uk/dp/B0CRZD8LTN) [**doff CONCENTRATED LIQUID SEAWEED 1L Green**Doff**£5.24**231 rev4y ago](https://www.amazon.co.uk/dp/B09TW4L7L3) [**ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer**Mifica**£16.30**485 rev5y ago](https://www.amazon.co.uk/dp/B093WTLRXB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer**Mifica**£16.30**4.5★**▲ 41%**](https://www.amazon.co.uk/dp/B093WTLRXB) [**3 x Doff 1L Liquid Seaweed Concentrated Multi-Purpose Feed**Doff**£11.07**4.6★**▲ 38%**](https://www.amazon.co.uk/dp/B073TZHLK7) [**Vitax Organic Liquid Seaweed Concentrated Bigger Crops Healthier Plants Suitable For Plants Flowers and Fruit & Vegetables- 1 Litres**Vitax Ltd**£7.44**4.6★**▲ 34%**](https://www.amazon.co.uk/dp/B0036186CO) [**The Shropshire Seaweed Co. Cold-Pressed Liquid Seaweed Fertilizer - Certified Organic Plant Food & Lawn Feed - Rich in Natural Nutrients for Growth Roots & Soil Health - Sustainably Sourced 5L**Shropshire Seaweed**£29.52**4.6★**▲ 23%**](https://www.amazon.co.uk/dp/B0064N2B1S) [**Maxicrop All Purpose Plant Growth Stimulant 1L - Natural Seaweed Based Liquid Biostimulant - Multivitamin Boost for All Garden Plants - Strong Roots - Healthy Growth - Builds Resilient Crops**Maxicrop**£6.44**4.5★**▲ 23%**](https://www.amazon.co.uk/dp/B000TAULWI)
**~~View all trending →~~**
## **What buyers say about seaweed liquid fertilizer**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**32%
*“Good quality and natural”*
**Value For Money**28%
*“Good price”*
**Efficiency**9%
*“Seaweed does it work”*
**Advertised Vs Actual Product**7%
*“As advertised”*
**Plant Growth**7%
*“I have taken on through the reviews that it really helps with plant growth”*
**Ease Of Use**6%
*“Easy to use”*
**Size-Overall**3%
*“Good size”*
**Design-Overall**1%
*“Really well designed container with integrated measuring top - no need for a measuring jug”*
**Instructions/User Manual/Troubleshooting**1%
*“Easy to use clear instructions”*
**Smell**1%
*“- very strong smelling which, hopefully, indicates a rich feed”*
### **What buyers complain about **
**Ease Of Use**14%
*“difficult to ascertain how successful it has been”*
**Value For Money**13%
*“Good size container bit expensive”*
**Functionality-Overall**10%
*“Don't use parcel force”*
**Measurement/Reading Accuracy**10%
*“Great product BUT it arrived without the measurement on top”*
**Leak-Proof**10%
*“Bottle leaks”*
**Smell**9%
*“It doesn't smell at all”*
**Instructions/User Manual/Troubleshooting**5%
*“However, there's no instructions and it isn't that intuitive”*
**Ease Of Cleaning**3%
*“Not easy to clean”*
**Plant Growth**3%
*“Cant see any difference in growth at all”*
**Spray/Flow**3%
*“sprayed absolutely everywhere in my house”*
### **Top return reasons **
**Leak-Proof**38%
**Defective Material/Parts**7%
**Value For Money**7%
**Advertised Vs Actual Product**7%
**Smell**6%
**Contamination**5%
**Functionality-Overall**5%
**Size-Overall**5%
**Ease Of Use**4%
**Mechanism Issues**3%
## **Common questions**
- **Is seaweed liquid fertilizer profitable to sell on Amazon United Kingdom?**
- The niche generates £565K/yr across 20 tracked products. 90-day search growth is +100.2%. Flapen's verdict: Worth a look (64/100).
- **How competitive is the seaweed liquid fertilizer niche?**
- 10 brands and 78 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in seaweed liquid fertilizer?**
- Top complaints mined from reviews: Ease Of Use, Value For Money, Functionality-Overall. The return rate is 0.0%.
- **When does demand for seaweed liquid fertilizer peak?**
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 22.3× the quietest.
- **What does it cost to enter the seaweed liquid fertilizer niche?**
- Listings span £4.97–£39.76; the average listing price is £17.16 (sweet spot $15–$100). The average incumbent carries 1,734 reviews — the moat a new listing must climb.
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