---
title: "Calcium for Plants — $65K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/calcium-for-plants"
last_updated: "2026-08-09T17:30:41.578Z"
locale: en
meta:
description: "Niche score 53/100 · $65K/yr market · 28K searches/yr · $15.03 avg price. A small market ($65K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $65K/yr market · 28K searches/yr · $15.03 avg price. A small market ($65K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Calcium for Plants — $65K/yr Amazon US Niche (2026) - Flapen"
---
# **calcium for plants**
**Worth a look**
Shows demand growing +222.2% this quarter, but a small market ($65K/yr) keeps it on the watch list.
Market size 16Growth 98Conversion 97Competition 19Returns 98Price range 49Avg price 75Brand share 31Review moat 32Quality gap 23
**Growth**
**Incredible****+222.2%**
90-day search growth — must beat 0% to launch
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.1%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$15.03**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$9.96–$19.85**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****3,306.79**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****86%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****77%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$65K**
$65K/yr · 28K 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, calcium for plants is a $65K/yr Amazon United States market (28K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Worth a look — 53/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **calcium for plants market data**
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$38K–$45K**
- units × avg price
- **Conversion rate**
- **15.1%**
- **Avg BSR**
- **#493**
- **Page quality**
- **0%**
- **Prime**
- **93%**
- **Sponsored**
- **64%**
- **Out of stock**
- **3.7%**
- **Avg brand age**
- **87 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**11 **▼falling
**Sellers**
**58**
**Top-5 brand share**
**86%**
Top 20: 100%
**Top-5 click share**
**77%**
Top 20: 100%
**Open market**
**10%**
- TPS NUTRIENTS27% - Bloom City24% - Bonide18% - Cz Garden Supply13% - Southern Ag5% - FOVGOTAN4% - Open — no brand owns it (5 brands, 10%)
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — +222.2% search growth over the last 90 days.
1K750Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 10.7×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/calcium-for-plants/trend)
## **Top calcium for plants 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%$6K20%$13K30%$19K40%$26K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 14 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz**TPS NUTRIENTS**$11.26**4.4★151 rev](https://www.amazon.com/dp/B0D4JGKYCC) [2**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) [3**Bonide Rot-Stop Tomato Blossom End Rot 16 oz Concentrated Liquid Garden Fertilizer for Calcium Deficiency Indoors & Outdoors**Bonide**$10.37**4.5★5,165 rev](https://www.amazon.com/dp/B000OOAL6U) [4**Calcium Nitrate 15.5-0-0 Fertilizer - Made in USA - 5LB Greenhouse Grade Plant Food for Hydroponics Plants & Gardens Fruit Vegetables. Blossom End Rot Tomatoes**Cz Garden Supply**$19.40**4.7★562 rev](https://www.amazon.com/dp/B0CF7RYDML) [5**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)
**~~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) [**1LB Calcium Nitrate Fertilizer 15.5-0-0 Nitrogen Fertilizer with Calcium Indoor Plant Fertilizer Plant Food for Houseplants Lawn Vegetable Trees Boost Stem & Leaf Growth Improves Root Health**FOVGOTAN**$9.96**25 rev7mo ago](https://www.amazon.com/dp/B0G4C658BT) [**Calcium Nitrate Fertilizer Liquid Fertilizer Supplement for Fast Leaf Growth Stronger Cell Wall Development & Prevents Blossom End Rot 8 oz**TPS NUTRIENTS**$11.86**152 rev1y ago](https://www.amazon.com/dp/B0DQTNRXBG) [**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) [**Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz**TPS NUTRIENTS**$11.26**151 rev2y ago](https://www.amazon.com/dp/B0D4JGKYCC)
**~~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★**▲ 95%**](https://www.amazon.com/dp/B0DG3QTDMT) [**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★**▲ 61%**](https://www.amazon.com/dp/B0DZHGNH79) [**1LB Calcium Nitrate Fertilizer 15.5-0-0 Nitrogen Fertilizer with Calcium Indoor Plant Fertilizer Plant Food for Houseplants Lawn Vegetable Trees Boost Stem & Leaf Growth Improves Root Health**FOVGOTAN**$9.96**4.4★**▲ 57%**](https://www.amazon.com/dp/B0G4C658BT) [**Oyster Shell Flour 5LB Made in USA - OMRI Listed - Soil Amendment Fertilizer for Plants & Flower Gardens. High Calcium Supplement for Chickens Reptiles Worm Compost Bins Mushroom Cultivation.**Cz Garden Supply**$19.85**4.8★**▲ 27%**](https://www.amazon.com/dp/B0BZQCWCYS) [**Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz**TPS NUTRIENTS**$11.26**4.4★**▲ 25%**](https://www.amazon.com/dp/B0D4JGKYCC)
**~~View all trending →~~**
## **What buyers say about calcium for plants**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**30%
*“Great product results in Beautiful plants”*
**Ease Of Use**15%
*“Easy to use”*
**Advertised Vs Actual Product**14%
*“As advertised”*
**Quality-Overall**12%
*“Reliable quality and consistent results”*
**Value For Money**12%
*“the price is reasonable”*
**Durability**2%
*“This stuff is strong, reliable and never runs out”*
**Functionality-Overall**1%
*“A large supply ad it works”*
**Moist/Dry**1%
*“No more dry rot at all”*
**Measurement/Reading Accuracy**1%
*“The liquid format makes it easy to work into a regular watering routine without any complicated measuring or mixing”*
**Maintenance And Repair**1%
*“Great, quickly fix”*
### **What buyers complain about **
**Plant Growth**38%
*“it didnt do much for my plants so use that for your own judgment”*
**Value For Money**11%
*“No a good value for the price”*
**Contamination**7%
*“Who knows if anything got blocked inside caused an infection which they died of”*
**Functionality-Overall**7%
*“Didnt work for me”*
**Size-Overall**6%
*“Bottle size feels bulky for smaller plant collections”*
**Quality-Overall**4%
*“garbage that doesnt work”*
**Color**4%
*“The yellowing has gone away”*
**Measurement/Reading Accuracy**4%
*“so youre not constantly measuring out large amounts”*
### **Top return reasons **
**Leak-Proof**30%
**Value For Money**18%
**Advertised Vs Actual Product**13%
**Functionality-Overall**9%
**Size-Overall**8%
**Defective Material/Parts**5%
**Instructions/User Manual/Troubleshooting**4%
**Plant Growth**3%
**Smell**2%
**Ease Of Use**2%
## **Common questions**
- **Is calcium for plants profitable to sell on Amazon United States?**
- The niche generates $65K/yr across 14 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +222.2%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the calcium for plants niche?**
- 11 brands and 58 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 86% of demand.
- **What do buyers complain about in calcium for plants?**
- Top complaints mined from reviews: Plant Growth, Value For Money, Contamination. The return rate is 0.4%.
- **When does demand for calcium for plants peak?**
- Demand peaks in May–Jun–Jul–Aug; the busiest month runs 10.7× the quietest.
- **What does it cost to enter the calcium for plants niche?**
- Listings span $9.96–$19.85; the average listing price is $15.03 (sweet spot $15–$100). The average incumbent carries 3,307 reviews — the moat a new listing must climb.
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