Is aquarium plant fertilizer profitable to sell on Amazon United States?

The niche generates $574K/yr across 22 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -7.8%. Flapen's verdict: Worth a look (53/100).

How competitive is the aquarium plant fertilizer niche?

11 brands and 62 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 92% of demand.

What do buyers complain about in aquarium plant fertilizer?

Top complaints mined from reviews: Leak-Proof, Contamination, Smell. The return rate is 0.5%.

When does demand for aquarium plant fertilizer peak?

Demand peaks in Feb; the busiest month runs 1.6× the quietest.

What does it cost to enter the aquarium plant fertilizer niche?

Listings span $7.67–$35.52; the average listing price is $15.68 (sweet spot $15–$100). The average incumbent carries 2,077 reviews — the moat a new listing must climb.

aquarium plant fertilizer

Worth a look

Shows low returns (0.5%), but brand-locked demand (top 5 brands take 92% of clicks) keeps it on the watch list.

Returns

Incredible0.5%

return rate — above 6% kills the launch gate

Conversion

Great11.9%

search→purchase rate — share of searches ending in a sale

Avg price

Great$15.68

avg listing price — sweet spot $15–$100

Price range

Good$7.67–$35.52

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Good$574K

$574K/yr · 308K searches

Review moat

Okay2,076.55

avg incumbent reviews — the moat a new listing must climb

Competition

Okay61%

top-5 click share — leaders hold, buyers still browse

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Bad-7.8%

90-day search growth — must beat 0% to launch

Brand share

Bad92%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, aquarium plant fertilizer is a $574K/yr Amazon United States market (308K searches/yr). The top 5 brands hold 92% of demand. Demand peaks in Feb. Verdict: Worth a look — 53/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

aquarium plant fertilizer market data

Units sold / yr: 30K–40K; avg 1,500–2,000/product
Revenue / yr: $470K–$627K; units × avg price
Launch success: —; 2 of 2 new (360d)
Conversion rate: 11.9%
Avg BSR: #251
Page quality: 0%
Prime: 100%
Sponsored: 64%
Out of stock: 0.0%
Avg brand age: 88 months
Avg seller age: 152 days

Competition & brand share

The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 rising

Sellers

Top-5 brand share

92%

Top 20: 100%

Top-5 click share

61%

Top 20: 98%

Open market

Seachem41%
API31%
NilocG Aquatics11%
crystalpro6%
MICROBE-LIFT3%
maozyiltle2%
Open — no brand owns it (5 brands, 6%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -7.8% search growth over the last 90 days.

Peak months: Feb · busiest ÷ quietest = 1.6×

Open Trend

Top aquarium plant fertilizer search terms

aquarium plant fertilizer73K/yr -15.5%9.1% conv.
seachem flourish48K/yr +3.6%12.1% conv.
aquarium fertilizer33K/yr -7.6%6.4% conv.
aquatic plant fertilizer20K/yr +36.0%6.6% conv.
easy green aquarium fertilizer25K/yr -7.1%4.2% conv.
aquarium plant food21K/yr -15.5%10.7% conv.
aquarium co-op easy green6K/yr +56.2%4.3% conv.
aquarium fertilizer for plants11K/yr -24.1%8.5% conv.
api leaf zone10K/yr -19.6%17.1% conv.
liquid fertilizer for aquarium plants10K/yr -32.1%9.0% conv.

All search terms

Top aquarium plant 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

API LEAF ZONE Freshwater Aquarium Plant Fertilizer 18-Ounce Bottle White

API$12.564.6★8,048 rev

Seachem Flourish Freshwater Plant Supplement 500 ml

Seachem$11.004.7★5,747 rev

Seachem Flourish Freshwater Plant Supplement - Aquarium Element and Nutrient Blend 100 ml (Model: 515)

Seachem$8.574.7★590 rev

API LEAF ZONE Freshwater Aquarium Plant Fertilizer 8-Ounce Bottle

API$8.124.7★1,865 rev

Seachem Flourish Excel 500 ml

Seachem$12.264.7★5,771 rev

Newest

by launch date

Root Tabs Freshwater Aquarium Plant Fertilizer Slow-Release 100 Tabs 1g/Tab Safe for Fish and Shrimp for Planted Aquarium Substrate (100)

Montorchid$13.4054 rev

4mo ago

Maozyiltle Root Tabs Aquarium Plant Fertilizer Aquarium Water Care Tabs 100 Tabs Aquarium Plant Food Safe for Fish and Shrimp Aquatic Plant Fertilizer for Planted Aquarium Substrate (100)

maozyiltle$13.54115 rev

7mo ago

Aquatic Plant Fertilizer Liquid Plant Food for Lush Growth Vibrant Color & Healthy Aquarium Plants 8 oz

TPS NUTRIENTS$11.7791 rev

1y ago

Crystalpro Flora Multi Minerals All-in-One Aquarium Plant Fertilizer - Plant Food for Fast Root & Leaf Growth - Safe for Fish Shrimp & Snails (4.2 Oz / 125ml)

crystalpro$7.67501 rev

3y ago

Brightwell Aquatics Shrimp FlorinMulti Complete Plant Nutrient 125 ml

Brightwell Aquatics$9.14263 rev

5y ago

What buyers say about aquarium plant fertilizer

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall27%

“Excellent Product”

Ease Of Use18%

“Easy to Use”

Plant Growth13%

“Has helped my plants grow”

Value For Money10%

“Good price”

Advertised Vs Actual Product7%

“As advertised”

Color4%

“Good color and growth”

Safety Standards2%

“It also gives me peace of mind knowing its safe for fish and shrimp”

Smell2%

“had that good smell of quality assurance”

Size-Overall2%

“good size”

Durability2%

“I also like that they are easy to break in case you want to spread it out”

What buyers complain about

Leak-Proof12%

“leaked all over the box”

Contamination12%

“white particle dust all over the place”

Smell11%

“there is a light odor”

Value For Money6%

“This may seem a little pricey to some”

Durability6%

“it broke apart in less than 2 days”

Functionality-Overall6%

“I dont think it works”

Ease Of Use5%

“Dont use”

Pest/Insect Control5%

“Killed all shrimp in my tank”

Quality-Overall4%

“I believe it was a quality control issue that needed to be addressed”

Product Condition3%

“Product arrived opened/used”

Top return reasons

Leak-Proof41%

Functionality-Overall13%

Value For Money10%

Advertised Vs Actual Product9%

Defective Material/Parts5%

Size-Overall4%

Smell3%

Contamination3%

Compatibility-Overall1%

Ingredients-Overall1%

Common questions

Is aquarium plant fertilizer profitable to sell on Amazon United States?: The niche generates $574K/yr across 22 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -7.8%. Flapen's verdict: Worth a look (53/100).
How competitive is the aquarium plant fertilizer niche?: 11 brands and 62 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 92% of demand.
What do buyers complain about in aquarium plant fertilizer?: Top complaints mined from reviews: Leak-Proof, Contamination, Smell. The return rate is 0.5%.
When does demand for aquarium plant fertilizer peak?: Demand peaks in Feb; the busiest month runs 1.6× the quietest.
What does it cost to enter the aquarium plant fertilizer niche?: Listings span $7.67–$35.52; the average listing price is $15.68 (sweet spot $15–$100). The average incumbent carries 2,077 reviews — the moat a new listing must climb.