---
title: "Cal Mag — $801K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/cal-mag"
last_updated: "2026-08-09T23:28:15.738Z"
locale: en
meta:
description: "Niche score 59/100 · $801K/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 59/100 · $801K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Cal Mag — $801K/yr Amazon US Niche (2026) - Flapen"
---
# **cal mag**
**Worth a look**
Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 73Growth 65Conversion 95Competition 30Returns 98Price range 85Avg price 90Brand share 29Review moat 25Quality gap 18
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.5%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$21.06**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.44–$40.83**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$801K**
$801K/yr · 305K searches
**Growth**
**Good****+43.9%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****67%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****87%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Bad****4,185.5**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, cal mag is a $801K/yr Amazon United States market (305K searches/yr). The top 5 brands hold 87% of demand. Demand peaks in May–Jun–Jul. Verdict: Worth a look — 59/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **cal mag market data**
- **Units sold / yr**
- **30K–40K**
- avg 2,000–2,500/product
- **Revenue / yr**
- **$632K–$842K**
- units × avg price
- **Conversion rate**
- **12.5%**
- **Avg BSR**
- **#494**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **78%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **106 months**
- **Avg seller age**
- **158 days**
## **Competition & brand share**
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**10 **▼falling
**Sellers**
**63**
**Top-5 brand share**
**87%**
Top 20: 100%
**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 & seasonality**
Weekly Amazon search volume, last 104 weeks — +43.9% search growth over the last 90 days.
15K10KSpike '25Prime Day '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jun, Jul · busiest ÷ quietest = 2.2×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/cal-mag/trend)
## **Top cal mag search terms**
- **cal mag**99K/yr+41.5%9.1% conv. - **cal mag for plants**55K/yr+65.1%10.8% conv. - **calmag**48K/yr+30.9%9.1% conv. - **calmag for plants**24K/yr+59.2%11.3% conv. - **cal-mag**11K/yr+46.9%8.3% conv. - **calmag for cannabis**12K/yr+23.4%9.8% conv. - **cal-mag for plants**8K/yr+66.5%11.6% conv. - **calmag+**7K/yr+59.2%9.4% conv. - **cal mag for cannabis**18K/yr-36.7%8.5% conv. - **cal mag fertilizer**4K/yr+287.6%7.2% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/cal-mag/search-terms)
## **Top cal mag 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%$40K10%$80K15%$120K20%$160K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)**Bloom City**$17.40**4.7★6,860 rev](https://www.amazon.com/dp/B073ZNQWCM) [2**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**Botanicare**$18.28**4.7★19,666 rev](https://www.amazon.com/dp/B004JKBMRW) [3**General Hydroponics CALiMAGic Quart**General Hydroponics**$18.05**4.8★9,493 rev](https://www.amazon.com/dp/B00GZRKI40) [4**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)**Bloom City**$11.47**4.7★6,860 rev](https://www.amazon.com/dp/B08JHFG5GH) [5**FoxFarm Bush Doctor Cal Mag for Plants -OMRI Listed for Organic Gardening - 1-0-0 3% Calcium 0.9% Magnesium - 1-Pint**FoxFarm**$17.96**4.7★2,926 rev](https://www.amazon.com/dp/B08SJ6VF5V)
**~~View all top sellers →~~**
### **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**Athena**$16.27**165 rev6mo ago](https://www.amazon.com/dp/B0DZHGNH79) [**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**HiThrive**$12.96**44 rev1y ago](https://www.amazon.com/dp/B0DG3QTDMT) [**Cal-Mag for Plants Plus Iron and Micros Calcium and Magnesium Prevent Common Deficiencies 2-0-0 CalMag Liquid Plant Fertilizer 8 oz**TPS NUTRIENTS**$11.44**242 rev2y ago](https://www.amazon.com/dp/B0D4JH767X) [**Cal-Mag Complete Calcium Magnesium Supplement with Micronutrients to Correct Deficiencies in Soil & Hydroponics 8 oz**TPS NUTRIENTS**$13.04**586 rev2y ago](https://www.amazon.com/dp/B0CT66BTF2) [**Botanicare Cal-Mag Plus Calcium Magnesium and Iron Plant Supplement 2-0-0 1 qt.**Botanicare**$19.32**279 rev2y ago](https://www.amazon.com/dp/B0CCMVZLS3)
**~~View all new products →~~**
### **Trending**
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**HiThrive**$12.96**4.7★**▲ 215%**](https://www.amazon.com/dp/B0DG3QTDMT) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Gallon (128 oz)**Bloom City**$36.67**4.7★**▲ 86%**](https://www.amazon.com/dp/B073ZP47ZN) [**Athena Blended CaMg | Cal Mag for Plants | Calcium Magnesium Fertilizer | Calmag for Hydroponics Coco & Soil | NPK 2-0-0 | 32 Ounce**Athena**$16.27**4.8★**▲ 78%**](https://www.amazon.com/dp/B0DZHGNH79) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)**Bloom City**$11.47**4.7★**▲ 65%**](https://www.amazon.com/dp/B08JHFG5GH) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)**Bloom City**$17.40**4.7★**▲ 54%**](https://www.amazon.com/dp/B073ZNQWCM)
**~~View all trending →~~**
## **What buyers say about cal mag**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**24%
*“The plants love it”*
**Quality-Overall**20%
*“Reliable quality and consistent results”*
**Ease Of Use**16%
*“Easy to use”*
**Value For Money**14%
*“Great value for the money”*
**Advertised Vs Actual Product**12%
*“As advertised”*
**Durability**2%
*“This stuff is strong, reliable and never runs out”*
**Functionality-Overall**1%
*“A large supply ad it works”*
**Color**1%
*“Within just a short time of using it, I noticed stronger stems, healthier leaves, and a deeper, richer green color overall”*
**Measurement/Reading Accuracy**1%
*“The liquid format makes it easy to work into a regular watering routine without any complicated measuring or mixing”*
**Moist/Dry**1%
*“No more dry rot at all”*
### **What buyers complain about **
**Plant Growth**43%
*“I cant believe how desperate I was getting with my plants”*
**Instructions/User Manual/Troubleshooting**10%
*“I think the instructions have you adding too much”*
**Size-Overall**8%
*“Bottle size feels bulky for smaller plant collections”*
**Measurement/Reading Accuracy**5%
*“so youre not constantly measuring out large amounts”*
**Color**5%
*“The yellowing has gone away”*
### **Top return reasons **
**Leak-Proof**41%
**Value For Money**13%
**Advertised Vs Actual Product**10%
**Size-Overall**7%
**Functionality-Overall**6%
**Defective Material/Parts**4%
**Plant Growth**3%
**Smell**3%
**Instructions/User Manual/Troubleshooting**2%
**Product Condition**1%
## **Common questions**
- **Is cal mag profitable to sell on Amazon United States?**
- The niche generates $801K/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +43.9%. Flapen's verdict: Worth a look (59/100).
- **How competitive is the cal mag niche?**
- 10 brands and 63 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 87% of demand.
- **What do buyers complain about in cal mag?**
- Top complaints mined from reviews: Plant Growth, Instructions/User Manual/Troubleshooting, Size-Overall. The return rate is 0.4%.
- **When does demand for cal mag peak?**
- Demand peaks in May–Jun–Jul; the busiest month runs 2.2× the quietest.
- **What does it cost to enter the cal mag niche?**
- Listings span $11.44–$40.83; the average listing price is $21.06 (sweet spot $15–$100). The average incumbent carries 4,186 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)