Is monopotassium phosphate profitable to sell on Amazon United States?

The niche generates $93K/yr across 12 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +209.4%. Flapen's verdict: Worth a look (56/100).

How competitive is the monopotassium phosphate niche?

9 brands and 10 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 84% of demand.

What do buyers complain about in monopotassium phosphate?

Top complaints mined from reviews: Plant Growth, Size-Overall, Instructions/User Manual/Troubleshooting. The return rate is 0.6%.

When does demand for monopotassium phosphate peak?

Demand peaks in May–Jun–Jul; the busiest month runs 6.0× the quietest.

What does it cost to enter the monopotassium phosphate niche?

Listings span $11.85–$98.35; the average listing price is $35.06 (sweet spot $15–$100). The average incumbent carries 963 reviews — the moat a new listing must climb.

monopotassium phosphate

Worth a look

Shows demand growing +209.4% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Growth

Incredible+209.4%

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

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Avg price

Incredible$35.06

avg listing price — sweet spot $15–$100

Price range

Great$11.85–$98.35

cheapest to priciest tracked listing — scored on the share inside $15–$100

Conversion

Good6.1%

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

Review moat

Good962.58

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay84%

top-5 brand share — brands hold most of the demand

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$93K

$93K/yr · 44K searches

Competition

Bad76%

top-5 click share — a locked-up shelf

Signals Trending Low Review Barrier

According to Flapen's Amazon United States niche tracking, monopotassium phosphate is a $93K/yr Amazon United States market (44K searches/yr). The top 5 brands hold 84% of demand. Demand peaks in May–Jun–Jul. Verdict: Worth a look — 56/100.

Data updated Jul 15, 2026 · scored weekly · How we score niches

monopotassium phosphate market data

Units sold / yr: 2K–3K; avg 100–250/product
Revenue / yr: $70K–$88K; units × avg price
Conversion rate: 6.1%
Avg BSR: #1,773
Page quality: 0%
Prime: 75%
Sponsored: 42%
Out of stock: 5.3%
Avg brand age: 83 months
Avg seller age: 151 days

Competition & brand share

The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.

Brands

9 falling

Sellers

Top-5 brand share

84%

Top 20: 100%

Top-5 click share

76%

Top 20: 100%

Open market

10%

Prevegenics54%
Humboldts Secret9%
NilocG Aquatics8%
Generic7%
Greenway Biotech, Inc.6%
Boca Hydro6%
Open — no brand owns it (3 brands, 10%)

Demand & seasonality

Weekly Amazon search volume, last 54 weeks — +209.4% search growth over the last 90 days.

Peak months: May, Jun, Jul · busiest ÷ quietest = 6.0×

Open Trend

Top monopotassium phosphate search terms

mkp fertilizer10K/yr +396.4%7.0% conv.
monopotassium phosphate12K/yr +121.4%5.5% conv.
mkp fertilizer 0-52-343K/yr >1,000%7.6% conv.
monopotassium phosphate fertilizer4K/yr +232.7%7.0% conv.
potassium dihydrogen phosphate6K/yr +83.3%2.1% conv.
mkp5K/yr +89.1%5.4% conv.
monopotassium2K/yr +201.5%0.3% conv.

All search terms

Top monopotassium phosphate 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★)2 products missing review or click data not plotted

All 12 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Monopotassium Phoshpate (MKP) Fertilizer | Highly Water Soluble | 0-52-34 (1 Pound)

Prevegenics$15.714.6★172 rev

Monopotassium Phoshpate (MKP) Fertilizer 0-52-34 | Highly Water Soluble | Supports Strong Root Development & Flowering | Enhances Flower Formation & Fruit Production | (5 Pounds)

Prevegenics$39.504.5★134 rev

Pure Monopotassium Phosphate (MKP) Fertilizer 05234 WaterSoluble 5 lbs

NilocG Aquatics$34.934.6★14 rev

Monopotassium Phosphate MKP 0-52-34 Highest Purity Haifa Grade Water Soluble Plant Nutrient Bloom Booster 2 lb

Generic$19.955.0★4 rev

Greenway Biotech Inc. Monopotassium Phosphate Fertilizer 0-52-34-100% Water Soluble Hydroponics for Root Strength - Increase Yield and Blooming - High Purity Plant Nutrient Formula - 1 Pound

Greenway Biotech, Inc.$33.644.6★603 rev

Newest

by launch date

Boca Hydro MKP 0-52-34 Mono Potassium Phosphate Hydroponic Grade Water Soluble Fertilizer Bloom Booster Flowering Enhancer Root Builder for Hydroponics Soil Fertigation Vegetables Trees (1 Lb)

Boca Hydro$18.000 rev

2mo ago

Boca Hydro MKP 0-52-34 Mono Potassium Phosphate Hydroponic Grade Water Soluble Fertilizer Bloom Booster Flowering Enhancer Root Builder for Hydroponics Soil Fertigation Vegetables Trees (5 Lb)

Boca Hydro$48.760 rev

2mo ago

Monopotassium Phosphate MKP 0-52-34 Highest Purity Haifa Grade Water Soluble Plant Nutrient Bloom Booster 2 lb

Generic$19.954 rev

4mo ago

Pure Monopotassium Phosphate (MKP) Fertilizer 05234 WaterSoluble 5 lbs

NilocG Aquatics$34.9314 rev

1y ago

Monopotassium Phosphate Fertilizer MKP 0-52-34 from Plantco | Promotes Root & Flower Growth Bloom Booster | Horticulture Grade Soluble Plant Food | 2 lb Bag

PLANTCO$31.098 rev

1y ago

What buyers say about monopotassium phosphate

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

What buyers love

Plant Growth46%

“My plants love it”

Quality-Overall25%

“Great product”

Value For Money10%

“Value for money”

Advertised Vs Actual Product9%

“As described”

Smell2%

“Favorite fragrance”

Ease Of Cleaning2%

“I also appreciate that it mixes cleanly”

Strength2%

“powerful”

Ease Of Use1%

“easy to use”

What buyers complain about

Plant Growth25%

“I cant tell its helping my flowering plants put out more flowers and fruits”

Size-Overall19%

“Flower getting bigger”

Instructions/User Manual/Troubleshooting13%

“no instructions as to where to water”

Leak-Proof13%

“about 1/3 of the liquid had dripped into the bag”

Product Condition13%

“good used”

Value For Money6%

“Its pricey”

Top return reasons

Leak-Proof32%

Size-Overall17%

Functionality-Overall11%

Advertised Vs Actual Product11%

Value For Money10%

Plant Growth7%

Contamination5%

Rusts/Corrodes1%

Instructions/User Manual/Troubleshooting1%

Product Condition1%

Common questions

Is monopotassium phosphate profitable to sell on Amazon United States?: The niche generates $93K/yr across 12 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +209.4%. Flapen's verdict: Worth a look (56/100).
How competitive is the monopotassium phosphate niche?: 9 brands and 10 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 84% of demand.
What do buyers complain about in monopotassium phosphate?: Top complaints mined from reviews: Plant Growth, Size-Overall, Instructions/User Manual/Troubleshooting. The return rate is 0.6%.
When does demand for monopotassium phosphate peak?: Demand peaks in May–Jun–Jul; the busiest month runs 6.0× the quietest.
What does it cost to enter the monopotassium phosphate niche?: Listings span $11.85–$98.35; the average listing price is $35.06 (sweet spot $15–$100). The average incumbent carries 963 reviews — the moat a new listing must climb.