potassium sulfate
Worth a lookShows low returns (0.3%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Returns
Incredible0.3%return rate — above 5% kills the launch gate
Growth
Incredible+132.4%90-day search growth — must beat 0% to launch
Avg price
Incredible$30.72avg listing price — sweet spot $15–$100
Review moat
Great171.81avg incumbent reviews — the moat a new listing must climb
Price range
Great$9.83–$85.27cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great7.6%search→purchase rate — share of searches ending in a sale
Brand share
Good67%top-5 brand share — brands hold most of the demand
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Market size
Okay$129K$129K/yr · 55K searches
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
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.Peak months: Apr, Jun, Jul · busiest ÷ quietest = 4.6×
Top potassium sulfate search terms
- sulfate of potash16K/yr
- potassium sulfate18K/yr
- potassium sulfate fertilizer8K/yr
- 0-0-50 fertilizer5K/yr
- potassium sulfate 0-0-504K/yr
- sulfate of potash 0-0-504K/yr
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.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Southern Ag Sulfate of Potash 0-0-50 5 LB Size: 5 LB
Root 98 Warehouse$19.744.6★157 rev
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$25.014.7★160 rev
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$17.664.7★451 rev
1 Pound - Potassium Sulfate - Sulfate of Potash
Alpha Chemicals$9.834.4★781 rev
Sulfate of Potash High-Potassium Supplement for Better Fruit Quality & Stronger Plants 8 oz
TPS NUTRIENTS$11.664.7★37 rev
Newest
by launch date
CountryMax Potash Fertilizer 50 lb High Potassium Plant Food for Strong Roots Improved Yield & Plant Health for Lawn & Garden
CountryMax$57.9113 rev
Potassium Sulfate Sulfate of Potash 0-0-50 Fertilizer for Vegetable Gardens Ideal for Soil Enrichment Plant Growth & Maximum Crop Yield (1 LB)
INTOMYTH$9.937 rev
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$69.395 rev
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$54.255 rev
Potassium Sulfate 0-0-50 for Vegetable Gardens Essential Nutrient for Plant Growth Soil Enrichment Crop Yield Optimization (1 lb)
HOLEVINT$10.0616 rev
Trending
90-day click momentumSouthern Ag Sulfate of Potash 0-0-50 5 LB Size: 5 LB
Root 98 Warehouse$19.694.6★
Potassium Sulfate Sulfate of Potash 0-0-50 Fertilizer for Vegetable Gardens Ideal for Soil Enrichment Plant Growth & Maximum Crop Yield (1 LB)
INTOMYTH$9.934.7★
CountryMax Potash Fertilizer 50 lb High Potassium Plant Food for Strong Roots Improved Yield & Plant Health for Lawn & Garden
CountryMax$57.914.4★
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$54.254.0★
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$10.174.6★
What buyers say about potassium sulfate
What buyers praise and complain about, mined from review topics.What buyers love
“My plants seem to be quite healthy”
“Easy to use”
“the value for money”
“Exactly what I needed”
“Good product, as described”
“colors seem richer”
“The bag is a simple clear bag with directions of use clearly written on”
“It makes their roots stronger”
“This fertilizer has very little odor. not at all unpleasant”
“It is easy to measure out”
What buyers complain about
“My plants do seem to have perked up a bit”
“It's a bit expensive per ounce for this small size bottle”
“could use better instructions”
“The small 8 oz size may also run out quickly if you have a larger garden or multiple plants to treat”
“Impure”
“Didnt work”
“The bottle I received was leaking”
“less likely to cause chloride toxicity in sensitive crops”
“There is an odd reference to women's fashion sneakers in the product listing”
“even though the soil was still damp from my morning watering”
Top return reasons
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.