---
title: "Liquid Kelp — $67K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/liquid-kelp"
last_updated: "2026-08-11T10:19:04.708Z"
locale: en
meta:
description: "Niche score 56/100 · $67K/yr market · 23K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $67K/yr market · 23K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Liquid Kelp — $67K/yr Amazon US Niche (2026) - Flapen"
---
# **liquid kelp**
**Worth a look**
Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 17Growth 96Conversion 94Competition 20Returns 98Price range 86Avg price 95Brand share 24Review moat 43Quality gap 28
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Growth**
**Incredible****+162.8%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$24.61**
avg listing price — sweet spot $15–$100
**Conversion**
**Great****11.8%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Great****$11.84–$40.30**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,155.13**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****91%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****76%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$67K**
$67K/yr · 23K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)")
According to Flapen's Amazon United States niche tracking, liquid kelp is a $67K/yr Amazon United States market (23K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 56/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **liquid kelp market data**
- **Units sold / yr**
- **2K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$49K–$62K**
- units × avg price
- **Conversion rate**
- **11.8%**
- **Avg BSR**
- **#688**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **81%**
- **Out of stock**
- **2.9%**
- **Avg brand age**
- **87 months**
- **Avg seller age**
- **161 days**
## **Competition & brand share**
The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**11 **▲rising
**Sellers**
**16**
**Top-5 brand share**
**91%**
Top 20: 100%
**Top-5 click share**
**76%**
Top 20: 100%
**Open market**
**7%**
- Bloom City40% - GS Plant Foods37% - Blue Planet Nutrients9% - TPS NUTRIENTS2% - Smart Grower2% - Neptune's Harvest2% - Open — no brand owns it (5 brands, 7%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +162.8% search growth over the last 90 days.
1K750Prime Day '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 4.3×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/liquid-kelp/trend)
## **Top liquid kelp 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%$7K20%$13K30%$20K40%$27K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**GS Plant Foods Liquid Kelp Fertilizer Suitable for Organic Growing OMRI Listed Seaweed Concentrate for Lawns Gardens & Soil - 1 Gallon (Makes Up To 800+ Gallons)**GS Plant Foods**$39.37**4.6★3,436 rev](https://www.amazon.com/dp/B089HSJQ4Q) [2**Bloom City Seaweed and Kelp Fertilizer Liquid Seaweed Supplement for Stronger Roots Faster Growth & Improved Stress Tolerance 32 oz**Bloom City**$19.20**4.6★5,473 rev](https://www.amazon.com/dp/B073ZNW8MX) [3**Bloom City Seaweed and Kelp Fertilizer Liquid Seaweed Supplement for Stronger Roots Faster Growth & Improved Stress Tolerance 8 oz**Bloom City**$12.32**4.6★5,473 rev](https://www.amazon.com/dp/B08JHHFZVG) [4**GS Plant Foods Liquid Kelp Fertilizer Suitable for Organic Growing OMRI Listed Seaweed Concentrate for Flowers Gardens Vegetables & Soil - 1 Quart (Makes Up to 200+ Gallons)**GS Plant Foods**$19.78**4.6★82 rev](https://www.amazon.com/dp/B0CL9WW5Q6) [5**Liquid Kelp Seaweed Fertilizer Concentrate - Blue Planet Nutrients Ascophyllum Nodosum Liquid Seaweed Supplement - Makes 470 Gallons - Quart (32 oz)**Blue Planet Nutrients**$20.12**4.7★3,620 rev](https://www.amazon.com/dp/B00UBEL5E0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KelpEdge Organic Liquid Kelp Plant Supplement- Seaweed Extract Concentrated Fertilizer Booster OMRI Listed - Boosts Roots Growth & Blooms for Gardens Lawns Veggies Hydro & All Plants**KelpEdge**$28.73**10 rev3mo ago](https://www.amazon.com/dp/B0GTX8XJGZ) [**Grow Queen Organic Liquid Kelp & Seaweed Extract Prop Drop (Ecklonia Maxima) Root + Plant Growth Hormone & Root Plant Food for Water Propagation Hydroponics & Soil 8oz 55 Gallons**Grow Queen**$18.74**140 rev8mo ago](https://www.amazon.com/dp/B0G1JMSPY5) [**Organic Sea Kelp Fertilizer for Plants Water-Soluble Makes 50 Gallons Kelp Meal Concentrate Plant Food for Indoor Gardens Hydroponics Vegetables Houseplants - Smart Grower - 2oz Bag**Smart Grower**$19.56**308 rev1y ago](https://www.amazon.com/dp/B0F94CXPVX) [**Nordic Kelp Boost Liquid - Perfect Plants (1 Gallon)**PERFECT PLANTS**$24.81**39 rev1y ago](https://www.amazon.com/dp/B0F5TBJMMZ) [**Seaweed Fertilizer Organic Kelp Plant Food for All Plants Boosts Nutrient Uptake for a Lush Vibrant Garden 8 oz**TPS NUTRIENTS**$11.84**127 rev2y ago](https://www.amazon.com/dp/B0D4JH9R3R)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**KelpEdge Organic Liquid Kelp Plant Supplement- Seaweed Extract Concentrated Fertilizer Booster OMRI Listed - Boosts Roots Growth & Blooms for Gardens Lawns Veggies Hydro & All Plants**KelpEdge**$28.73**4.4★**▲ 73%**](https://www.amazon.com/dp/B0GTX8XJGZ) [**Organic Super Seaweed Humic Acid Blend- Liquid Sea Kelp for Grass and Plants - Soil Hume - Simple Grow Solutions- Natural Lawn & Garden Concentrate- Use with Fertilizer Program (32 Ounce)**Simple Lawn Solutions**$22.57**4.6★**▲ 33%**](https://www.amazon.com/dp/B07QPB5H63) [**Bloom City Seaweed and Kelp Fertilizer Liquid Seaweed Supplement for Stronger Roots Faster Growth & Improved Stress Tolerance 1 Gallon**Bloom City**$38.15**4.6★**▲ 17%**](https://www.amazon.com/dp/B073ZNW5CK) [**Grow Queen Organic Liquid Kelp & Seaweed Extract Prop Drop (Ecklonia Maxima) Root + Plant Growth Hormone & Root Plant Food for Water Propagation Hydroponics & Soil 8oz 55 Gallons**Grow Queen**$18.74**4.7★**▲ 17%**](https://www.amazon.com/dp/B0G1JMSPY5) [**Liquid Kelp Seaweed Fertilizer Concentrate - Blue Planet Nutrients Ascophyllum Nodosum Liquid Seaweed Supplement - Makes 470 Gallons - Quart (32 oz)**Blue Planet Nutrients**$20.12**4.7★**— 6%**](https://www.amazon.com/dp/B00UBEL5E0)
**~~View all trending →~~**
## **What buyers say about liquid kelp**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**58%
*“Great plant growth”*
**Quality-Overall**12%
*“Great affordable products quality company”*
**Value For Money**6%
*“Good value”*
**Smell**6%
*“Doesnt stink”*
**Ease Of Use**5%
*“Easy to use”*
**Advertised Vs Actual Product**2%
*“Worked as advertised”*
**Strength**2%
*“Effective”*
**Instructions/User Manual/Troubleshooting**2%
*“follow instruction”*
**Spray/Flow**2%
*“I also like using it as a foliar spray”*
**Color**1%
*“And green”*
### **What buyers complain about **
**Value For Money**21%
*“This stuff is a bit pricey”*
**Plant Growth**15%
*“Here is my honest breakdown after using it for a full growing season: The Pros: The 7-Day Turnaround: I had a couple of stunted”*
**Smell**13%
*“Smelly”*
**Quality-Overall**6%
*“Trash”*
**Size-Overall**6%
*“This was a very small package”*
**Thickness**6%
*“Very thin, diluted kelp mixture”*
**Hard Feel**3%
*“some of the plants seem hardier than they've ever been”*
**Color**2%
*“The color has dark appearance once diluted in the water”*
**Ease Of Cleaning**2%
*“was always messy to mix up”*
### **Top return reasons **
**Leak-Proof**34%
**Size-Overall**13%
**Advertised Vs Actual Product**12%
**Functionality-Overall**11%
**Value For Money**9%
**Smell**5%
**Plant Growth**4%
**Defective Material/Parts**2%
**Product Condition**1%
**Contamination**1%
## **Common questions**
- **Is liquid kelp profitable to sell on Amazon United States?**
- The niche generates $67K/yr across 16 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +162.8%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the liquid kelp niche?**
- 11 brands and 16 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 91% of demand.
- **What do buyers complain about in liquid kelp?**
- Top complaints mined from reviews: Value For Money, Plant Growth, Smell. The return rate is 0.4%.
- **When does demand for liquid kelp peak?**
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 4.3× the quietest.
- **What does it cost to enter the liquid kelp niche?**
- Listings span $11.84–$40.30; the average listing price is $24.61 (sweet spot $15–$100). The average incumbent carries 2,155 reviews — the moat a new listing must climb.
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