aluminum sulfate for blue hydrangeas
Worth a lookShows demand growing +334.6% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Growth
Incredible+334.6%90-day search growth — must beat 0% to launch
Returns
Incredible0.4%return rate — above 5% kills the launch gate
Conversion
Incredible12.9%search→purchase rate — share of searches ending in a sale
Avg price
Great$17.40avg listing price — sweet spot $15–$100
Price range
Great$6.63–$43.03cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good530.82avg incumbent reviews — the moat a new listing must climb
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay77%top-5 brand share — brands hold most of the demand
Competition
Bad73%top-5 click share — a locked-up shelf
Market size
Bad$63K$63K/yr · 28K searches
According to Flapen's Amazon United States niche tracking, aluminum sulfate for blue hydrangeas is a $63K/yr Amazon United States market (28K searches/yr). The top 5 brands hold 77% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 62/100.
Data updated Jul 15, 2026 · scored weekly · How we score niches
aluminum sulfate for blue hydrangeas market data
- Units sold / yr
- 3K–4K
- avg 250–500/product
- Revenue / yr
- $52K–$70K
- units × avg price
- Conversion rate
- 12.9%
- Avg BSR
- #1,000
- Page quality
- 0%
- Prime
- 82%
- Sponsored
- 76%
- Out of stock
- 3.6%
- Avg brand age
- 87 months
- Avg seller age
- 164 days
Competition & brand share
The top 5 products capture 73% of clicks — a locked-up shelf that new listings rarely crack.Brands
14 falling
Sellers
50
Top-5 brand share
77%
Top 20: 100%
Top-5 click share
73%
Top 20: 100%
Open market
19%
- Hoffman28%
- TPS NUTRIENTS16%
- Earth Science15%
- GARDENWISE12%
- Espoma5%
- Southern Ag4%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +334.6% search growth over the last 90 days.Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 106.6×
Top aluminum sulfate for blue hydrangeas 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 17 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Hoffman Blue Magic Aluminum Sulfate
Hoffman$19.624.6★276 rev
Hydrangea Fertilizer Liquid Plant Food for Bigger Blooms Rich Flower Color & Stronger Root Development 8 oz
TPS NUTRIENTS$11.624.5★1,176 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
Southern Ag Aluminum Sulfate (Acidifies Soil) 5 LB Size: 5 LB
Southern Ag$18.704.6★294 rev
Newest
by launch date
Usdlaaia Hydrangea Fertilizer to Turn Blue 100g Hydrangea Bluing Plant Acidifier Aluminum Sulfate Soil Acidifier for HydrangeaBlue Aluminum Sulfate Soil PH Lowerer for Gardens & Ponds for Home Gard
Usdlaaia$6.630 rev
Aluminum Sulfate 5 lb.
Generic$18.872 rev
Aluminum Sulfate 16 oz - Soil Acidifier for Hydrangeas to Turn Blue | Lowers Soil pH Fast | Garden & Pond Use | Aluminum Sulfate for Hydrangeas Plants Soil (16 oz)
Eyaeyao$16.844 rev
GARDENWISE Slow Release Hydrangea Fertilizer with Iron & Sulfur Indoor & Outdoor Soil Acidifier for Miracle Growth (12 oz)
GARDENWISE$9.92568 rev
GARDENWISE Slow Release Hydrangea Fertilizer with Iron & Sulfur Indoor & Outdoor Soil Acidifier for Miracle Growth (1/2 qt)
GARDENWISE$13.45568 rev
Trending
90-day click momentumAluminum Sulfate 5 lb.
Generic$18.875.0★
Usdlaaia Hydrangea Fertilizer to Turn Blue 100g Hydrangea Bluing Plant Acidifier Aluminum Sulfate Soil Acidifier for HydrangeaBlue Aluminum Sulfate Soil PH Lowerer for Gardens & Ponds for Home Gard
Usdlaaia$6.630.0★
Espoma Organic Soil Acidifier Soil Amendment; Lowers Soil pH and Turns Hydrangeas Blue! Contains Elemental Sulfur and can be Used for Organic Gardening 6 lb. Bag - Pack of 2
Espoma$27.184.7★
Pure Original Ingredients Aluminum Sulfate (4 oz) Iron Free Soil Additive
PURE ORIGINAL INGREDIENTS$10.504.5★
GARDENWISE Slow Release Hydrangea Fertilizer with Iron & Sulfur Indoor & Outdoor Soil Acidifier for Miracle Growth (1/2 qt)
GARDENWISE$13.454.4★
What buyers say about aluminum sulfate for blue hydrangeas
What buyers praise and complain about, mined from review topics.What buyers love
“Helped the plants tremendously”
“Excellent product”
“a beautiful blue”
“As advertised”
“Decent amount for the price”
“Easy to use”
“the instructions were clear”
“Convenient Package Size”
“Strong”
“Perfect for reducing ph”
What buyers complain about
“The bag is very small”
“it will not flower”
“not blue”
“not worth the money for the amount you get”
“Doesn't work”
“Total garbage”
“The picture on the Amazon site looks like a much larger bag”
“Had inborn gnats”
“I didnt measure”
“Waste”
Top return reasons
Common questions
- Is aluminum sulfate for blue hydrangeas profitable to sell on Amazon United States?
- The niche generates $63K/yr across 17 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is +334.6%. Flapen's verdict: Worth a look (62/100).
- How competitive is the aluminum sulfate for blue hydrangeas niche?
- 14 brands and 50 sellers compete. The top 5 products take 73% of clicks and top 5 brands hold 77% of demand.
- What do buyers complain about in aluminum sulfate for blue hydrangeas?
- Top complaints mined from reviews: Size-Overall, Plant Growth, Color. The return rate is 0.4%.
- When does demand for aluminum sulfate for blue hydrangeas peak?
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 106.6× the quietest.
- What does it cost to enter the aluminum sulfate for blue hydrangeas niche?
- Listings span $6.63–$43.03; the average listing price is $17.40 (sweet spot $15–$100). The average incumbent carries 531 reviews — the moat a new listing must climb.