---
title: "Calcium for Tomato Plants — $388K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/calcium-for-tomato-plants"
last_updated: "2026-08-09T17:34:09.896Z"
locale: en
meta:
description: "Niche score 56/100 · $388K/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 56/100 · $388K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Calcium for Tomato Plants — $388K/yr Amazon US Niche (2026) - Flapen"
---
# **calcium for tomato plants**
**Worth a look**
Shows demand growing +521.8% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 55Growth 100Conversion 100Competition 10Returns 98Price range 47Avg price 66Brand share 0Review moat 39Quality gap 37
**Growth**
**Incredible****+521.8%**
90-day search growth — must beat 0% to launch
**Conversion**
**Incredible****21.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Avg price**
**Good****$13.88**
avg listing price — sweet spot $15–$100
**Market size**
**Good****$388K**
$388K/yr · 130K searches
**Price range**
**Okay****$10.07–$19.40**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,641.33**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****88%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)")
According to Flapen's Amazon United States niche tracking, calcium for tomato plants is a $388K/yr Amazon United States market (130K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Worth a look — 56/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **calcium for tomato plants market data**
- **Units sold / yr**
- **20K–25K**
- avg 1,500–2,000/product
- **Revenue / yr**
- **$278K–$347K**
- units × avg price
- **Conversion rate**
- **21.4%**
- **Avg BSR**
- **#436**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **56%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **93 months**
- **Avg seller age**
- **150 days**
## **Competition & brand share**
The top 5 products capture 88% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**5 **▼falling
**Sellers**
**47**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**88%**
Top 20: 100%
**Open market**
**0%**
- Bonide56% - Bloom City19% - TPS NUTRIENTS12% - Cz Garden Supply8% - Southern Ag5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +521.8% search growth over the last 90 days.
10K6KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 36.5×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/calcium-for-tomato-plants/trend)
## **Top calcium for tomato plants search terms**
- **calcium for tomato plants**30K/yr+582.1%12.8% conv. - **calcium for plants**22K/yr+235.6%8.8% conv. - **rot stop for tomatoes**8K/yr>1,000%28.0% conv. - **blossom end rot treatment**7K/yr>1,000%18.2% conv. - **rot stop**9K/yr+907.4%23.1% conv. - **calcium for tomatoes**5K/yr+777.6%11.7% conv. - **calcium fertilizer**7K/yr+183.8%6.3% conv. - **liquid calcium for plants**5K/yr+555.2%11.3% conv. - **tomato fertilizer with calcium**4K/yr+480.4%5.1% conv. - **calcium fertilizer for tomatoes**4K/yr+880.0%11.5% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/calcium-for-tomato-plants/search-terms)
## **Top calcium for tomato 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%15%$58K30%$116K45%$175K60%$233K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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) [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 32 oz Ready-to-Use Spray Garden Fertilizer for Calcium Deficiency in Plants**Bonide**$10.07**4.1★1,688 rev](https://www.amazon.com/dp/B000OWB63O) [4**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) [5**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)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**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) [**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) [**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**562 rev2y ago](https://www.amazon.com/dp/B0CF7RYDML) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)**Bloom City**$11.47**6,860 rev3y ago](https://www.amazon.com/dp/B08JHFG5GH) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)**Bloom City**$17.40**6,860 rev9y ago](https://www.amazon.com/dp/B073ZNQWCM)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Bonide Rot-Stop Tomato Blossom End Rot 16 oz Concentrated Liquid Garden Fertilizer for Calcium Deficiency Indoors & Outdoors**Bonide**$10.37**4.5★**▲ 17%**](https://www.amazon.com/dp/B000OOAL6U) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)**Bloom City**$11.47**4.7★**▲ 13%**](https://www.amazon.com/dp/B08JHFG5GH) [**Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz**TPS NUTRIENTS**$11.26**4.4★**▲ 12%**](https://www.amazon.com/dp/B0D4JGKYCC) [**Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)**Bloom City**$17.40**4.7★**— 2%**](https://www.amazon.com/dp/B073ZNQWCM) [**Bonide Rot-Stop Tomato Blossom End Rot 32 oz Ready-to-Use Spray Garden Fertilizer for Calcium Deficiency in Plants**Bonide**$10.07**4.1★**▼ 16%**](https://www.amazon.com/dp/B000OWB63O)
**~~View all trending →~~**
## **What buyers say about calcium for tomato plants**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**41%
*“The plants are producing well”*
**Advertised Vs Actual Product**17%
*“As advertised”*
**Quality-Overall**13%
*“Reliable quality and consistent results”*
**Ease Of Use**10%
*“Easy to use”*
**Value For Money**6%
*“Great price would buy it again over and over again”*
**Durability**3%
*“This stuff is strong, reliable and never runs out”*
**Maintenance And Repair**3%
*“Great, quickly fix”*
**Color**1%
*“It gave my plants a healthy green vibrant look”*
**Ease Of Cleaning**1%
*“The formula is clean”*
### **What buyers complain about **
**Plant Growth**55%
*“I never saw any improvement in new growth”*
**Functionality-Overall**11%
*“Didnt work for me”*
**Quality-Overall**7%
*“I should have paid more attention to the negative reviews”*
**Size-Overall**4%
*“It's a rather large bottle”*
**Value For Money**4%
*“total waste of money”*
**Color**4%
*“the leaves are yellowing”*
**Contamination**2%
*“BURNED MY PLANTS”*
**Water Resistance**2%
*“The spray goes on watery”*
**Adhesion/Stickiness**2%
*“doesnt seem to stick to the fruit or leaves”*
### **Top return reasons **
**Leak-Proof**36%
**Advertised Vs Actual Product**16%
**Value For Money**16%
**Functionality-Overall**6%
**Defective Material/Parts**5%
**Size-Overall**4%
**Instructions/User Manual/Troubleshooting**4%
**Smell**3%
**Quality-Overall**2%
**Plant Growth**2%
## **Common questions**
- **Is calcium for tomato plants profitable to sell on Amazon United States?**
- The niche generates $388K/yr across 9 tracked products. 90-day search growth is +521.8%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the calcium for tomato plants niche?**
- 5 brands and 47 sellers compete. The top 5 products take 88% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in calcium for tomato plants?**
- Top complaints mined from reviews: Plant Growth, Functionality-Overall, Quality-Overall. The return rate is 0.4%.
- **When does demand for calcium for tomato plants peak?**
- Demand peaks in May–Jun–Jul–Aug; the busiest month runs 36.5× the quietest.
- **What does it cost to enter the calcium for tomato plants niche?**
- Listings span $10.07–$19.40; the average listing price is $13.88 (sweet spot $15–$100). The average incumbent carries 2,641 reviews — the moat a new listing must climb.
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