Cal Mag
MaybeAn estimated 0.4% of orders come back. But the products selling today already average 4.7★, so Cal Mag is a Maybe.
- Flapen Score
- 59 / 100Top 36% of 8,839 Patio, Lawn & Garden niches · +3 vs the category median of 5659
- Market size
- $801K/yr305K searches / yr
- 90-day growth
- +43.9%search demand this quarter
- Competition
- 67%top-5 click share · 10 brands · 63 sellers
Flapen Score
Cal Mag against its category
The dotted line is the Patio, Lawn & Garden average. Past it, Cal Mag is stronger. Inside it, weaker.
Market
The Cal Mag market on Amazon at a glance
Shoppers on Amazon United States searched for Cal Mag 305K times last year and spent an estimated $801K. The top 5 brands take 87% of clicks. Demand peaks in May–Jun–Jul. Flapen scores it 59 out of 100, a Maybe.
01 · Demand
An estimated 12.5% of those searches ended in a purchase.
Shoppers searched for this 305K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 12.5% of those searches ended in a purchase. Searches in the last 90 days moved +43.9% against the 90 days before. Searches, conversion and average price together put the market at an estimated $801K a year.
- Searches, last 12 months
- 305K
- Growth, 90 days vs prior 90
- +43.9%
- Conversion, latest week
- 12.5%
- Market size, estimated
- $801Ka year
- Peak month
- July2.2× the quietest month
- Top search term
- cal mag99K searches a year
02 · Price
A sale here is worth $21.06.
Listings sell for $21.06 on average, from $11.44 to $40.83. Amazon reports units sold in ranges. This niche sold 30K to 40K a year. The average listing sells 2,000 to 2,500 of them. At $21.06 that is $42K to $53K a year per listing.
- Average price
- $21.06inside the $15 to $100 sweet spot
- Price range
- $11.44–$40.83
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 30K–40K
- Units per listing a year
- 2,000–2,500
- Revenue per listing a year
- $42K–$53K
- Returns
- 0.4%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
78% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #494 within Soils, Mulches & Planting Media. It carries 4,186 reviews at 4.72 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 78%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #494in Soils, Mulches & Planting Media
- Average rating
- 4.72 starsAmazon United States average 4.42 stars
- Average reviews
- 4,186per listing
- Listings tracked
- 18
04 · Newcomers
1 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 106 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 106 months
Products
Top Cal Mag products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 15, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)
- Price
- $17.40
- Rating
- 4.7/5
- Reviews
- 6,860
- Age
- 9y ago

Botanicare Cal-Mag Plus A Calcium Magnesium And Iron Plant Supplement Corrects Common Plant Deficiencies Add To Water Or Use As A Spray 2-0-0 NPK Quart
- Price
- $18.28
- Rating
- 4.7/5
- Reviews
- 19,666
- Age
- 22y ago

General Hydroponics CALiMAGic Quart
- Price
- $18.05
- Rating
- 4.8/5
- Reviews
- 9,493
- Age
- 14y ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)
- Price
- $11.47
- Rating
- 4.7/5
- Reviews
- 6,860
- Age
- 3y ago

FoxFarm Bush Doctor Cal Mag for Plants -OMRI Listed for Organic Gardening - 1-0-0 3% Calcium 0.9% Magnesium - 1-Pint
- Price
- $17.96
- Rating
- 4.7/5
- Reviews
- 2,926
- Age
- 5y ago
Trending
estimated 90-day click momentum
16oz Cal Mag for Plants - Makes 96 Gallons of Calmag for Plants Fertilizer Liquid Cal-Mag for Plants Indoors & Outdoors Ideal Calmag Supplement with 3-0-0 NPK - Corrects Common Plant Deficiencies
- Price
- $12.96
- Rating
- 4.7/5
- Reviews
- 44
- Age
- 1y ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Gallon (128 oz)
- Price
- $36.67
- Rating
- 4.7/5
- Reviews
- 6,860
- Age
- 6y ago

Athena Blended CaMg | Cal Mag for Plants | Calcium Magnesium Fertilizer | Calmag for Hydroponics Coco & Soil | NPK 2-0-0 | 32 Ounce
- Price
- $16.27
- Rating
- 4.8/5
- Reviews
- 165
- Age
- 6mo ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)
- Price
- $11.47
- Rating
- 4.7/5
- Reviews
- 6,860
- Age
- 3y ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)
- Price
- $17.40
- Rating
- 4.7/5
- Reviews
- 6,860
- Age
- 9y ago
Newest
by launch date
Athena Blended CaMg | Cal Mag for Plants | Calcium Magnesium Fertilizer | Calmag for Hydroponics Coco & Soil | NPK 2-0-0 | 32 Ounce
- Price
- $16.27
- Rating
- 4.8/5
- Reviews
- 165
- Age
- 6mo ago

16oz Cal Mag for Plants - Makes 96 Gallons of Calmag for Plants Fertilizer Liquid Cal-Mag for Plants Indoors & Outdoors Ideal Calmag Supplement with 3-0-0 NPK - Corrects Common Plant Deficiencies
- Price
- $12.96
- Rating
- 4.7/5
- Reviews
- 44
- Age
- 1y ago

Cal-Mag for Plants Plus Iron and Micros Calcium and Magnesium Prevent Common Deficiencies 2-0-0 CalMag Liquid Plant Fertilizer 8 oz
- Price
- $11.44
- Rating
- 4.6/5
- Reviews
- 242
- Age
- 2y ago

Cal-Mag Complete Calcium Magnesium Supplement with Micronutrients to Correct Deficiencies in Soil & Hydroponics 8 oz
- Price
- $13.04
- Rating
- 4.7/5
- Reviews
- 586
- Age
- 2y ago

Botanicare Cal-Mag Plus Calcium Magnesium and Iron Plant Supplement 2-0-0 1 qt.
- Price
- $19.32
- Rating
- 4.7/5
- Reviews
- 279
- Age
- 2y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 67% of clicks. Leaders hold, but buyers still shop past them.
Brands
10 falling
Sellers
63
Est. top-5 brand share
87%
Top 20: 100%
Est. top-5 click share
67%
Top 20: 100%
Open market
6%
- Bloom City30%
- Botanicare23%
- General Hydroponics16%
- FoxFarm10%
- TPS NUTRIENTS9%
- Athena7%
- Open — no brand owns it (4 brands, 6%)
Demand
Cal Mag search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: May, Jun, Jul · busiest ÷ quietest = 2.2×
Search terms
Top Cal Mag search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- cal mag99K/yr
- cal mag for plants55K/yr
- calmag48K/yr
- calmag for plants24K/yr
- cal-mag11K/yr
- calmag for cannabis12K/yr
- cal-mag for plants8K/yr
- calmag+7K/yr
- cal mag for cannabis18K/yr
- cal mag fertilizer4K/yr
Reviews and returns
What reviews say buyers love and hate about Cal Mag
We read the reviews and the return reasons for every product selling here.
“I cant believe how desperate I was getting with my plants”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
16 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Cal Mag questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









