---
title: "Iron Sulfate — $65K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/iron-sulfate"
last_updated: "2026-08-11T06:00:57.530Z"
locale: en
meta:
description: "Niche score 58/100 · $65K/yr market · 60K 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 58/100 · $65K/yr market · 60K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Iron Sulfate — $65K/yr Amazon US Niche (2026) - Flapen"
---
# **iron sulfate**
**Worth a look**
Shows low returns (0.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 16Growth 81Conversion 75Competition 48Returns 100Price range 59Avg price 75Brand share 67Review moat 25Quality gap 38
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Growth**
**Great****+75.7%**
90-day search growth — must beat 0% to launch
**Conversion**
**Great****7.1%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$15.17**
avg listing price — sweet spot $15–$100
**Brand share**
**Good****65%**
top-5 brand share — brands hold most of the demand
**Price range**
**Good****$4.81–$29.91**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****4,311.96**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Bad****$65K**
$65K/yr · 60K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
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 ~~](https://flapen.com/research/methodology)
## **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.
5K3KSpike '25Spike '26 seasonMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Apr, May · busiest ÷ quietest = 7.4×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/iron-sulfate/trend)
## **Top iron sulfate search terms**
- **iron sulfate**28K/yr+77.0%6.6% conv. - **iron sulfate for plants**21K/yr+70.5%8.4% conv. - **sulfato de hierro para plantas**10K/yr+108.0%3.2% conv. - **iron sulphate**2K/yr+6.3%5.0% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/iron-sulfate/search-terms)
## **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.
0%5%$3K10%$6K15%$10K20%$13K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Ferrous Sulfate for Plants Liquid Iron Sulfate for Plants for Greener Leaves Improved Chlorophyll Production & Reduced Yellowing 8 oz**TPS NUTRIENTS**$11.70**4.5★368 rev](https://www.amazon.com/dp/B0DQTV6HL9) [2**Hi-Yield (32340) Iron sulfate (4 lbs.)**Hi-Yield**$21.56**4.5★438 rev](https://www.amazon.com/dp/B07CRNTR7G) [3**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**$9.37**4.4★150 rev](https://www.amazon.com/dp/B0DJL1TRLP) [4**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**$22.78**4.6★869 rev](https://www.amazon.com/dp/B0BS3S1RPV) [5**GARDENWISE Slow Release Hydrangea Fertilizer with Iron & Sulfur Indoor & Outdoor Soil Acidifier for Miracle Growth (12 oz)**GARDENWISE**$9.92**4.4★568 rev](https://www.amazon.com/dp/B0DNV3GGTQ)
**~~View all top sellers →~~**
### **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**$13.93**9 rev9mo ago](https://www.amazon.com/dp/B0FWRD9XLX) [**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**$9.95**6 rev9mo ago](https://www.amazon.com/dp/B0FTM8M8S7) [**Hi-Yield (34340) Iron Sulfate (3.25 lbs.)**Hi-Yield**$18.63**11 rev1y ago](https://www.amazon.com/dp/B0CTD4B6VW) [**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**$6.95**105 rev1y ago](https://www.amazon.com/dp/B0DZ1TQZJK) [**Ferrous Sulfate for Plants Liquid Iron Sulfate for Plants for Greener Leaves Improved Chlorophyll Production & Reduced Yellowing 8 oz**TPS NUTRIENTS**$11.70**368 rev1y ago](https://www.amazon.com/dp/B0DQTV6HL9)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$13.93**3.9★**▲ 84%**](https://www.amazon.com/dp/B0FWRD9XLX) [**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**$9.95**4.8★**▲ 81%**](https://www.amazon.com/dp/B0FTM8M8S7) [**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**$22.94**4.4★**▲ 40%**](https://www.amazon.com/dp/B0BS3VW84F) [**Ironite Plus Shrubs Trees Plant Food Bag Granular 12-10-10 3lb**Ironite**$8.55**4.6★**▲ 36%**](https://www.amazon.com/dp/B0030BNI8W) [**Ferrous Sulfate Heptahydrate - FeSO4*7H2O - 20% Iron - Very Soluble - 5 Pounds**Alpha Chemicals**$19.20**4.6★**▲ 24%**](https://www.amazon.com/dp/B007ODUNJ4)
**~~View all trending →~~**
## **What buyers say about iron sulfate**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**15%
*“Good quality arrived quickly”*
**Iron**15%
*“Good iron tablet”*
**Value For Money**11%
*“Good value for the money”*
**Plant Growth**11%
*“My plants are looking so healthy”*
**Advertised Vs Actual Product**10%
*“It does what it says it does”*
**Vitamin**4%
*“Great vitamin”*
**Ease Of Use**4%
*“Quick and easy”*
**Efficiency**3%
*“Works well”*
**Energy Level**3%
*“Good for my energy”*
**Ease Of Chewing/Swallowing**2%
*“Easy on your tummy”*
### **What buyers complain about **
**Taste-Overall**14%
*“Strong metallic taste”*
**Iron**13%
*“Low on Iron”*
**Plant Growth**5%
*“My once pretty flowers are no longer”*
**Color**5%
*“which were grayed”*
**Quality-Overall**3%
*“Not as good as reviews indicate”*
**Value For Money**3%
*“Not worth the price”*
**Size-Overall**3%
*“Small bag for the price”*
**Advertised Vs Actual Product**2%
*“The caps in the pictures are very misleading”*
**Ease Of Use**2%
*“Hard to Take”*
**Functionality-Overall**2%
*“Didnt work”*
### **Top return reasons **
**Size-Overall**19%
**Advertised Vs Actual Product**19%
**Value For Money**15%
**Leak-Proof**15%
**Functionality-Overall**10%
**Plant Growth**3%
**Instructions/User Manual/Troubleshooting**2%
**Iron**2%
**Stain Resistance**2%
**Defective Material/Parts**1%
## **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.
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