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.

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.

Growth

Incredible+521.8%

90-day search growth — must beat 0% to launch

Conversion

Incredible21.4%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.4%

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

Okay2,641.33

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Competition

Bad88%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Signals Trending

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

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

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

88%

Top 20: 100%

Open market

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.

Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 36.5×

Open Trend

Top calcium for tomato plants search terms

calcium for tomato plants30K/yr +582.1%12.8% conv.
calcium for plants22K/yr +235.6%8.8% conv.
rot stop for tomatoes8K/yr >1,000%28.0% conv.
blossom end rot treatment7K/yr >1,000%18.2% conv.
rot stop9K/yr +907.4%23.1% conv.
calcium for tomatoes5K/yr +777.6%11.7% conv.
calcium fertilizer7K/yr +183.8%6.3% conv.
liquid calcium for plants5K/yr +555.2%11.3% conv.
tomato fertilizer with calcium4K/yr +480.4%5.1% conv.
calcium fertilizer for tomatoes4K/yr +880.0%11.5% conv.

All 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.

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

Bonide Rot-Stop Tomato Blossom End Rot 16 oz Concentrated Liquid Garden Fertilizer for Calcium Deficiency Indoors & Outdoors

Bonide$10.374.5★5,165 rev

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)

Bloom City$17.404.7★6,860 rev

Bonide Rot-Stop Tomato Blossom End Rot 32 oz Ready-to-Use Spray Garden Fertilizer for Calcium Deficiency in Plants

Bonide$10.074.1★1,688 rev

Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz

TPS NUTRIENTS$11.264.4★151 rev

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$19.404.7★562 rev

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$11.86152 rev

1y ago

Calcium for Plants Liquid Calcium Supplement for Stronger Growth Healthier New Leaves & Reduced Deficiencies 8 oz

TPS NUTRIENTS$11.26151 rev

2y ago

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$19.40562 rev

2y ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer 1/2 Pint (8 oz)

Bloom City$11.476,860 rev

3y ago

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer Quart (32 oz)

Bloom City$17.406,860 rev

9y ago

What buyers say about calcium for tomato plants

What buyers praise and complain about, mined from review topics.

What buyers love

Plant Growth41%

“The plants are producing well”

Advertised Vs Actual Product17%

“As advertised”

Quality-Overall13%

“Reliable quality and consistent results”

Ease Of Use10%

“Easy to use”

Value For Money6%

“Great price would buy it again over and over again”

Durability3%

“This stuff is strong, reliable and never runs out”

Maintenance And Repair3%

“Great, quickly fix”

Color1%

“It gave my plants a healthy green vibrant look”

Ease Of Cleaning1%

“The formula is clean”

What buyers complain about

Plant Growth55%

“I never saw any improvement in new growth”

Functionality-Overall11%

“Didnt work for me”

Quality-Overall7%

“I should have paid more attention to the negative reviews”

Size-Overall4%

“It's a rather large bottle”

Value For Money4%

“total waste of money”

Color4%

“the leaves are yellowing”

Contamination2%

“BURNED MY PLANTS”

Water Resistance2%

“The spray goes on watery”

Adhesion/Stickiness2%

“doesnt seem to stick to the fruit or leaves”

Top return reasons

Leak-Proof36%

Advertised Vs Actual Product16%

Value For Money16%

Functionality-Overall6%

Defective Material/Parts5%

Size-Overall4%

Instructions/User Manual/Troubleshooting4%

Smell3%

Quality-Overall2%

Plant Growth2%

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.