seaweed liquid fertilizer
Worth a lookShows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible15.3%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£17.16avg listing price — sweet spot $15–$100
Price range
Good£4.97–£39.76cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good£565K£565K/yr · 215K searches
Review moat
Okay1,733.65avg incumbent reviews — the moat a new listing must climb
Brand share
Okay81%top-5 brand share — brands hold most of the demand
Competition
Okay65%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
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
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.Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 22.3×
Top seaweed liquid fertilizer search terms
- seaweed fertiliser94K/yr
- liquid seaweed30K/yr
- liquid seaweed fertiliser21K/yr
- seaweed plant food14K/yr
- liquid seaweed feed for plants15K/yr
- seaweed fertilizer12K/yr
- seaweed feed9K/yr
- organic seaweed fertiliser6K/yr
- sea weed fertiliser3K/yr
- liquid seaweed for lawns4K/yr
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.
All 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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£11.414.6★7,292 rev
doff CONCENTRATED LIQUID SEAWEED 1L Green
Doff£5.244.6★231 rev
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£6.444.5★1,029 rev
ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer
Mifica£16.304.5★485 rev
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£12.214.6★1,008 rev
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£35.55111 rev
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£21.3570 rev
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£25.28111 rev
doff CONCENTRATED LIQUID SEAWEED 1L Green
Doff£5.24231 rev
ALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer
Mifica£16.30485 rev
Trending
90-day click momentumALGA-SOL Cold Press Concentrate Seaweed Extract Ascophyllum Seaweed Extract 5Ltr Biostimulant Fertiliser Fertilizer Seaweed Plant Feed Organic Fertiliser Fertilizer
Mifica£16.304.5★
3 x Doff 1L Liquid Seaweed Concentrated Multi-Purpose Feed
Doff£11.074.6★
Vitax Organic Liquid Seaweed Concentrated Bigger Crops Healthier Plants Suitable For Plants Flowers and Fruit & Vegetables- 1 Litres
Vitax Ltd£7.444.6★
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£29.524.6★
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£6.444.5★
What buyers say about seaweed liquid fertilizer
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality and natural”
“Good price”
“Seaweed does it work”
“As advertised”
“I have taken on through the reviews that it really helps with plant growth”
“Easy to use”
“Good size”
“Really well designed container with integrated measuring top - no need for a measuring jug”
“Easy to use clear instructions”
“- very strong smelling which, hopefully, indicates a rich feed”
What buyers complain about
“difficult to ascertain how successful it has been”
“Good size container bit expensive”
“Don't use parcel force”
“Great product BUT it arrived without the measurement on top”
“Bottle leaks”
“It doesn't smell at all”
“However, there's no instructions and it isn't that intuitive”
“Not easy to clean”
“Cant see any difference in growth at all”
“sprayed absolutely everywhere in my house”
Top return reasons
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.