iron sulfate
Worth a lookShows low returns (0.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Growth
Great+75.7%90-day search growth — must beat 0% to launch
Conversion
Great7.1%search→purchase rate — share of searches ending in a sale
Avg price
Great$15.17avg listing price — sweet spot $15–$100
Brand share
Good65%top-5 brand share — brands hold most of the demand
Price range
Good$4.81–$29.91cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay56%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Bad4,311.96avg incumbent reviews — the moat a new listing must climb
Market size
Bad$65K$65K/yr · 60K searches
According to Flapen's Amazon United States niche tracking, iron sulfate is a $65K/yr Amazon United States market (60K searches/yr). The top 5 brands hold 65% of demand. Demand peaks in Apr–May. Verdict: Worth a look — 58/100.
Data updated Jul 15, 2026 · scored weekly · How we score niches
iron sulfate market data
- Units sold / yr
- 4K–5K
- avg 100–250/product
- Revenue / yr
- $61K–$76K
- units × avg price
- Conversion rate
- 7.1%
- Avg BSR
- #936
- Page quality
- 0%
- Prime
- 92%
- Sponsored
- 76%
- Out of stock
- 0.0%
- Avg brand age
- 95 months
- Avg seller age
- 156 days
Competition & brand share
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.Brands
19 rising
Sellers
151
Top-5 brand share
65%
Top 20: 100%
Top-5 click share
56%
Top 20: 95%
Open market
29%
- Hi-Yield21%
- TPS NUTRIENTS18%
- OULLYY10%
- Earth Science10%
- GARDENWISE6%
- Alpha Chemicals6%
Demand & seasonality
Weekly Amazon search volume, last 66 weeks — +75.7% search growth over the last 90 days.Peak months: Apr, May · busiest ÷ quietest = 7.4×
Top iron sulfate search terms
- iron sulfate28K/yr
- iron sulfate for plants21K/yr
- sulfato de hierro para plantas10K/yr
- iron sulphate2K/yr
Top iron sulfate 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Ferrous Sulfate for Plants Liquid Iron Sulfate for Plants for Greener Leaves Improved Chlorophyll Production & Reduced Yellowing 8 oz
TPS NUTRIENTS$11.704.5★368 rev
Hi-Yield (32340) Iron sulfate (4 lbs.)
Hi-Yield$21.564.5★438 rev
Ferrous Sulfate Fertilizer for Plants Ferrous Sulfate Heptahydrate Granules 20% Iron (Fe) - Plant Food to Help Greener Grass Lawn shrubs Trees and Gardens (1 Pound)
OULLYY$9.374.4★150 rev
Earth Science Fast Acting Sulfur Granules 5lb Reduces Soil pH and Nutrient Runoff Improves Growth & Color for Acid-Loving Plants Long-Lasting Lawn Care Supplement
Earth Science$22.784.6★869 rev
GARDENWISE Slow Release Hydrangea Fertilizer with Iron & Sulfur Indoor & Outdoor Soil Acidifier for Miracle Growth (12 oz)
GARDENWISE$9.924.4★568 rev
Newest
by launch date
XIXISUSU Iron Sulfate for Plants - Ferrous Sulfate Powder to Correct Chlorosis & Yellow Leaves Fast-Acting Iron for Plants Trees Lawns & Shrubs - Essential Nutrient Supplement (8 oz)
xixisusu$13.939 rev
EYAEYAO Ferrous Sulfate Granules 20% Iron Soil Acidifier for Lawns & Plants | Fast Greening for Grass Turf Shrubs Trees Flowers & Gardens | Corrects Iron Deficiency & Yellowing (8 oz)
Eyaeyao$9.956 rev
Hi-Yield (34340) Iron Sulfate (3.25 lbs.)
Hi-Yield$18.6311 rev
GRANDAN Ferrous Sulfate Heptahydrate - 3/16 Inch FeSO4*7H2O Granules - 20% Iron (Fe) Stable and Easy to Store - Organic Lawn Fertilizer for Vegetables and Plant Growth (8 Oz)
GRANDAN$6.95105 rev
Ferrous Sulfate for Plants Liquid Iron Sulfate for Plants for Greener Leaves Improved Chlorophyll Production & Reduced Yellowing 8 oz
TPS NUTRIENTS$11.70368 rev
Trending
90-day click momentumXIXISUSU Iron Sulfate for Plants - Ferrous Sulfate Powder to Correct Chlorosis & Yellow Leaves Fast-Acting Iron for Plants Trees Lawns & Shrubs - Essential Nutrient Supplement (8 oz)
xixisusu$13.933.9★
EYAEYAO Ferrous Sulfate Granules 20% Iron Soil Acidifier for Lawns & Plants | Fast Greening for Grass Turf Shrubs Trees Flowers & Gardens | Corrects Iron Deficiency & Yellowing (8 oz)
Eyaeyao$9.954.8★
Earth Science IronPro Fast Acting Lawn Garden Iron Supplement5 lbDeep Green Results for Grass Flowers Vegetables & Shrubs Non-Staining & Non-Burning Easy Apply Formula Covers 1600 Sq. Ft
Earth Science$22.944.4★
Ironite Plus Shrubs Trees Plant Food Bag Granular 12-10-10 3lb
Ironite$8.554.6★
Ferrous Sulfate Heptahydrate - FeSO4*7H2O - 20% Iron - Very Soluble - 5 Pounds
Alpha Chemicals$19.204.6★
What buyers say about iron sulfate
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality arrived quickly”
“Good iron tablet”
“Good value for the money”
“My plants are looking so healthy”
“It does what it says it does”
“Great vitamin”
“Quick and easy”
“Works well”
“Good for my energy”
“Easy on your tummy”
What buyers complain about
“Strong metallic taste”
“Low on Iron”
“My once pretty flowers are no longer”
“which were grayed”
“Not as good as reviews indicate”
“Not worth the price”
“Small bag for the price”
“The caps in the pictures are very misleading”
“Hard to Take”
“Didnt work”
Top return reasons
Common questions
- Is iron sulfate profitable to sell on Amazon United States?
- The niche generates $65K/yr across 25 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is +75.7%. Flapen's verdict: Worth a look (58/100).
- How competitive is the iron sulfate niche?
- 19 brands and 151 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 65% of demand.
- What do buyers complain about in iron sulfate?
- Top complaints mined from reviews: Taste-Overall, Iron, Plant Growth. The return rate is 0.1%.
- When does demand for iron sulfate peak?
- Demand peaks in Apr–May; the busiest month runs 7.4× the quietest.
- What does it cost to enter the iron sulfate niche?
- Listings span $4.81–$29.91; the average listing price is $15.17 (sweet spot $15–$100). The average incumbent carries 4,312 reviews — the moat a new listing must climb.