---
title: "Potassium Sulfate — $129K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/potassium-sulfate"
last_updated: "2026-08-11T01:38:01.075Z"
locale: en
meta:
description: "Niche score 66/100 · $129K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 66/100 · $129K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Potassium Sulfate — $129K/yr Amazon US Niche (2026) - Flapen"
---
# **potassium sulfate**
**Worth a look**
Shows low returns (0.3%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 29Growth 96Conversion 77Competition 44Returns 98Price range 90Avg price 95Brand share 63Review moat 91Quality gap 30
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Growth**
**Incredible****+132.4%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$30.72**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****171.81**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Great****$9.83–$85.27**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****7.6%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Good****67%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****58%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****$129K**
$129K/yr · 55K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** 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, potassium sulfate is a $129K/yr Amazon United States market (55K searches/yr). The top 5 brands hold 67% of demand. Demand peaks in Apr–Jun–Jul. Verdict: Worth a look — 66/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **potassium sulfate market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **$123K–$154K**
- units × avg price
- **Conversion rate**
- **7.6%**
- **Avg BSR**
- **#1,089**
- **Page quality**
- **0%**
- **Prime**
- **62%**
- **Sponsored**
- **76%**
- **Out of stock**
- **10.6%**
- **Avg brand age**
- **79 months**
- **Avg seller age**
- **154 days**
## **Competition & brand share**
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▼falling
**Sellers**
**30**
**Top-5 brand share**
**67%**
Top 20: 100%
**Top-5 click share**
**58%**
Top 20: 99%
**Open market**
**26%**
- Root 98 Warehouse23% - Cz Garden Supply15% - TPS NUTRIENTS11% - Down To Earth All Natural Fertilizers10% - Alpha Chemicals8% - Supply Solutions7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +132.4% search growth over the last 90 days.
2K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, Jun, Jul · busiest ÷ quietest = 4.6×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/potassium-sulfate/trend)
## **Top potassium sulfate search terms**
- **sulfate of potash**16K/yr+132.8%9.0% conv. - **potassium sulfate**18K/yr+98.5%6.6% conv. - **potassium sulfate fertilizer**8K/yr+111.2%6.9% conv. - **0-0-50 fertilizer**5K/yr+174.2%5.7% conv. - **potassium sulfate 0-0-50**4K/yr+273.0%7.9% conv. - **sulfate of potash 0-0-50**4K/yr+166.9%9.1% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/potassium-sulfate/search-terms)
## **Top potassium 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%10%$13K20%$26K30%$39K40%$52K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Southern Ag Sulfate of Potash 0-0-50 5 LB Size: 5 LB**Root 98 Warehouse**$19.74**4.6★157 rev](https://www.amazon.com/dp/B0BL7XQ18Q) [2**Organic Sulfate of Potash 0-0-50 Made in USA - OMRI Listed - Water Soluble SOP Potassium Plant Food for Plants & Flower Gardens - 3LB Low Chlorine Fertilizer. Enhances Color & Taste!**Cz Garden Supply**$25.01**4.7★160 rev](https://www.amazon.com/dp/B0BZQK86TK) [3**Down To Earth All Natural Fertilizers Organic Solution Grade Potassium Sulfate - Professional Grade SOP Powder 200 mesh for Liquid or Spray Applications 0-0-50 1 lb**Down To Earth All Natural Fertilizers**$17.66**4.7★451 rev](https://www.amazon.com/dp/B07ST16WKQ) [4**1 Pound - Potassium Sulfate - Sulfate of Potash**Alpha Chemicals**$9.83**4.4★781 rev](https://www.amazon.com/dp/B004JD6MGK) [5**Sulfate of Potash High-Potassium Supplement for Better Fruit Quality & Stronger Plants 8 oz**TPS NUTRIENTS**$11.66**4.7★37 rev](https://www.amazon.com/dp/B0DQTM1Y2W)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**CountryMax Potash Fertilizer 50 lb High Potassium Plant Food for Strong Roots Improved Yield & Plant Health for Lawn & Garden**CountryMax**$57.91**13 rev3mo ago](https://www.amazon.com/dp/B0GV1NX3K9) [**Potassium Sulfate Sulfate of Potash 0-0-50 Fertilizer for Vegetable Gardens Ideal for Soil Enrichment Plant Growth & Maximum Crop Yield (1 LB)**INTOMYTH**$9.93**7 rev4mo ago](https://www.amazon.com/dp/B0GR4LHGLX) [**Supply Solutions | 0-0-50 Plus 17% Sulfur | Golden K-Max Sulfate of Potash (SOP) - Granular Fertilizer | High Potassium Plant Fertilizer for Indoor and Outdoor Garden - Stronger Roots (40 Pounds)**Supply Solutions**$69.39**5 rev4mo ago](https://www.amazon.com/dp/B0GPDKQNTJ) [**Supply Solutions | 0-0-50 Plus 17% Sulfur | Golden K-Max Sulfate of Potash (SOP) - Granular Fertilizer | High Potassium Plant Fertilizer for Indoor and Outdoor Garden - Stronger Roots (25 Pounds)**Supply Solutions**$54.25**5 rev4mo ago](https://www.amazon.com/dp/B0GPDVLQJP) [**Potassium Sulfate 0-0-50 for Vegetable Gardens Essential Nutrient for Plant Growth Soil Enrichment Crop Yield Optimization (1 lb)**HOLEVINT**$10.06**16 rev7mo ago](https://www.amazon.com/dp/B0G5X2XNW4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Southern Ag Sulfate of Potash 0-0-50 5 LB Size: 5 LB**Root 98 Warehouse**$19.69**4.6★**▲ 83%**](https://www.amazon.com/dp/B0056QF79M) [**Potassium Sulfate Sulfate of Potash 0-0-50 Fertilizer for Vegetable Gardens Ideal for Soil Enrichment Plant Growth & Maximum Crop Yield (1 LB)**INTOMYTH**$9.93**4.7★**▲ 82%**](https://www.amazon.com/dp/B0GR4LHGLX) [**CountryMax Potash Fertilizer 50 lb High Potassium Plant Food for Strong Roots Improved Yield & Plant Health for Lawn & Garden**CountryMax**$57.91**4.4★**▲ 80%**](https://www.amazon.com/dp/B0GV1NX3K9) [**Supply Solutions | 0-0-50 Plus 17% Sulfur | Golden K-Max Sulfate of Potash (SOP) - Granular Fertilizer | High Potassium Plant Fertilizer for Indoor and Outdoor Garden - Stronger Roots (25 Pounds)**Supply Solutions**$54.25**4.0★**▲ 67%**](https://www.amazon.com/dp/B0GPDVLQJP) [**1lb Potash Fertilizer 0-0-50 Sulfate of Potash Indoor Plant Fertilizer Potassium Fertilizer Plant Food for Houseplants Fruit Flower Tomato Promote Large Flower Blooming & Fruit Growth**FOVGOTAN**$10.17**4.6★**▲ 58%**](https://www.amazon.com/dp/B0G2VNNL58)
**~~View all trending →~~**
## **What buyers say about potassium sulfate**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**40%
*“My plants seem to be quite healthy”*
**Ease Of Use**13%
*“Easy to use”*
**Value For Money**10%
*“the value for money”*
**Advertised Vs Actual Product**10%
*“Exactly what I needed”*
**Quality-Overall**10%
*“Good product, as described”*
**Color**2%
*“colors seem richer”*
**Instructions/User Manual/Troubleshooting**2%
*“The bag is a simple clear bag with directions of use clearly written on”*
**Strength**1%
*“It makes their roots stronger”*
**Smell**1%
*“This fertilizer has very little odor. not at all unpleasant”*
**Measurement/Reading Accuracy**1%
*“It is easy to measure out”*
### **What buyers complain about **
**Plant Growth**17%
*“My plants do seem to have perked up a bit”*
**Value For Money**11%
*“It's a bit expensive per ounce for this small size bottle”*
**Instructions/User Manual/Troubleshooting**11%
*“could use better instructions”*
**Size-Overall**8%
*“The small 8 oz size may also run out quickly if you have a larger garden or multiple plants to treat”*
**Strength**8%
*“Impure”*
**Functionality-Overall**5%
*“Didnt work”*
**Leak-Proof**5%
*“The bottle I received was leaking”*
**Contamination**3%
*“less likely to cause chloride toxicity in sensitive crops”*
**Advertised Vs Actual Product**2%
*“There is an odd reference to women's fashion sneakers in the product listing”*
**Moist/Dry**1%
*“even though the soil was still damp from my morning watering”*
### **Top return reasons **
**Advertised Vs Actual Product**26%
**Value For Money**17%
**Size-Overall**14%
**Leak-Proof**11%
**Functionality-Overall**7%
**Plant Growth**6%
**Eco Friendliness**3%
**Smell**2%
**Strength**2%
**Heating**2%
## **Common questions**
- **Is potassium sulfate profitable to sell on Amazon United States?**
- The niche generates $129K/yr across 21 tracked products. 4 of 6 products launched in the last 360 days are still selling. 90-day search growth is +132.4%. Flapen's verdict: Worth a look (66/100).
- **How competitive is the potassium sulfate niche?**
- 13 brands and 30 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 67% of demand.
- **What do buyers complain about in potassium sulfate?**
- Top complaints mined from reviews: Plant Growth, Value For Money, Instructions/User Manual/Troubleshooting. The return rate is 0.3%.
- **When does demand for potassium sulfate peak?**
- Demand peaks in Apr–Jun–Jul; the busiest month runs 4.6× the quietest.
- **What does it cost to enter the potassium sulfate niche?**
- Listings span $9.83–$85.27; the average listing price is $30.72 (sweet spot $15–$100). The average incumbent carries 172 reviews — the moat a new listing must climb.
## **Related niches in Patio, Lawn & Garden**
- 82 [**lawn aerator**](https://flapen.com/research/us/patio-lawn-garden/lawn-aerator)$6.2M/yr+90.1%**Launch it**- 82 [**shepherds hooks for outdoor**](https://flapen.com/research/us/patio-lawn-garden/shepherds-hooks-for-outdoor)$3.9M/yr+141.2%**Launch it**- 82 [**garden mesh**](https://flapen.com/research/us/patio-lawn-garden/garden-mesh)$716K/yr+152.7%**Worth a look**- 83 [**chicken waterer**](https://flapen.com/research/us/patio-lawn-garden/chicken-waterer)$3.4M/yr+70.1%**Launch it**- 83 [**75 foot garden hose**](https://flapen.com/research/us/patio-lawn-garden/75-foot-garden-hose)$1.8M/yr+117.6%**Launch it**- 83 [**bird deterrents for outside**](https://flapen.com/research/us/patio-lawn-garden/bird-deterrents-for-outside)$2.1M/yr+131.5%**Launch it**[**All Patio, Lawn & Garden niches **](https://flapen.com/research/us/patio-lawn-garden)