---
title: "Phosphorus and Potassium Fertilizers — $57K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/phosphorus-and-potassium-fertilizers"
last_updated: "2026-08-11T03:18:00.156Z"
locale: en
meta:
description: "Niche score 51/100 · $57K/yr market · 40K searches/yr · $19.63 avg price. A small market ($57K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 51/100 · $57K/yr market · 40K searches/yr · $19.63 avg price. A small market ($57K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Phosphorus and Potassium Fertilizers — $57K/yr Amazon US Niche (2026) - Flapen"
---
# **phosphorus and potassium fertilizers**
**Worth a look**
Shows demand growing +266.5% this quarter, but a small market ($57K/yr) keeps it on the watch list.
Market size 14Growth 99Conversion 76Competition 18Returns 98Price range 81Avg price 87Brand share 14Review moat 36Quality gap 24
**Growth**
**Incredible****+266.5%**
90-day search growth — must beat 0% to launch
**Returns**
**Incredible****0.3%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$19.63**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.85–$29.80**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****7.3%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Okay****2,867.1**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****79%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$57K**
$57K/yr · 40K searches
**Brand share**
**Bad****95%**
top-5 brand share — brand-locked demand
**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, phosphorus and potassium fertilizers is a $57K/yr Amazon United States market (40K searches/yr). The top 5 brands hold 95% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 15, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **phosphorus and potassium fertilizers market data**
- **Units sold / yr**
- **2K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$39K–$49K**
- units × avg price
- **Conversion rate**
- **7.3%**
- **Avg BSR**
- **#253**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **90%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **78 months**
- **Avg seller age**
- **143 days**
## **Competition & brand share**
The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**28**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**79%**
Top 20: 100%
**Open market**
**2%**
- TPS NUTRIENTS50% - Farmer's Secret26% - Element Nutrients9% - Prevegenics5% - FoxFarm4% - Espoma3% - Open — no brand owns it (1 brand, 2%)
## **Top phosphorus and potassium fertilizers search terms**
- **phosphorus and potassium fertilizers**15K/yr+395.3%6.3% conv. - **high phosphorus and potassium fertilizer**5K/yr+332.6%5.0% conv. - **phosphorus and potassium fertilizer**7K/yr+192.5%5.1% conv. - **potassium and phosphorus fertilizer**6K/yr+177.2%5.0% conv. - **phosphorus potassium fertilizer**4K/yr+283.3%5.2% conv. - **pk fertilizer**3K/yr+95.4%2.1% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/phosphorus-and-potassium-fertilizers/search-terms)
## **Top phosphorus and potassium fertilizers 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%$9K30%$17K45%$26K60%$34K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 8 oz**TPS NUTRIENTS**$11.85**4.5★172 rev](https://www.amazon.com/dp/B0DQTQZKK4) [2**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (32oz)**Farmer's Secret**$29.80**4.6★3,186 rev](https://www.amazon.com/dp/B09JJ2C8RS) [3**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (8oz)**Farmer's Secret**$12.99**4.6★3,186 rev](https://www.amazon.com/dp/B09JB7K1K3) [4**Bloom Booster and Yield Enhancer for Plants - Big Heavy Healthy Harvests for Use in Soil and Hydroponics - Concentrated Phosphorus and Potassium - Flower Fuel 1-34-32 250g**Element Nutrients**$21.97**4.6★10,300 rev](https://www.amazon.com/dp/B01L32CE20) [5**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 32 oz**TPS NUTRIENTS**$24.44**4.5★172 rev](https://www.amazon.com/dp/B0DQTRBM2J)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 8 oz**TPS NUTRIENTS**$11.85**172 rev1y ago](https://www.amazon.com/dp/B0DQTQZKK4) [**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 32 oz**TPS NUTRIENTS**$24.44**172 rev1y ago](https://www.amazon.com/dp/B0DQTRBM2J) [**Triple Super Phosphate 0-46-0 Fertilizer high Phosphorus Fertilizer Stronger Roots & Flower Formation Ideal Super Phosphate for Plants - Flowers Fruits Vegetables & Turf 5 lb**The Grow Co**$18.33**418 rev2y ago](https://www.amazon.com/dp/B0CN53M7LT) [**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (32oz)**Farmer's Secret**$29.80**3,186 rev4y ago](https://www.amazon.com/dp/B09JJ2C8RS) [**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (16oz)**Farmer's Secret**$20.39**3,186 rev4y ago](https://www.amazon.com/dp/B09JGR7FXG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (8oz)**Farmer's Secret**$12.99**4.6★**▲ 45%**](https://www.amazon.com/dp/B09JB7K1K3) [**Farmers Secret Fruit & Bloom Booster Fertilizer - Super Concentrated - Boosts Flowering and Yield on All Varieties of Fruits Vegetables and Flowers (16oz)**Farmer's Secret**$20.39**4.6★**▲ 39%**](https://www.amazon.com/dp/B09JGR7FXG) [**Triple Super Phosphate 0-46-0 Fertilizer high Phosphorus Fertilizer Stronger Roots & Flower Formation Ideal Super Phosphate for Plants - Flowers Fruits Vegetables & Turf 5 lb**The Grow Co**$18.33**4.6★**▲ 34%**](https://www.amazon.com/dp/B0CN53M7LT) [**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 32 oz**TPS NUTRIENTS**$24.44**4.5★**▲ 27%**](https://www.amazon.com/dp/B0DQTRBM2J) [**Phosphorus & Potassium Fertilizer Liquid Bloom Booster for Strong Roots Better Blooms & Improved Fruit Development 8 oz**TPS NUTRIENTS**$11.85**4.5★**▲ 22%**](https://www.amazon.com/dp/B0DQTQZKK4)
**~~View all trending →~~**
## **What buyers say about phosphorus and potassium fertilizers**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Plant Growth**57%
*“It has boosted the growth”*
**Quality-Overall**15%
*“Excellent product”*
**Value For Money**7%
*“Great value”*
**Advertised Vs Actual Product**5%
*“Works as advertised”*
**Ease Of Use**4%
*“Easy to use”*
**Strength**2%
*“You add this to any plant and it will really grow your plants healthy and strong”*
**Color**2%
*“The color of all blooms is so vibrant”*
**Smell**1%
*“Works well and doesn't smell. as other rose foods do”*
**Durability**1%
*“It is durable”*
**Ease Of Cleaning**0%
*“I also appreciate that it mixes cleanly”*
### **What buyers complain about **
**Plant Growth**26%
*“Turned my plants brown”*
**Size-Overall**14%
*“Flower getting bigger”*
**Leak-Proof**7%
*“about 1/3 of the liquid had dripped into the bag”*
**Value For Money**7%
*“so buying this fertilizer will be expensive for me”*
**Advertised Vs Actual Product**5%
*“False Advertisement. contains Nitrogen”*
**Quality-Overall**5%
*“Poor quality control”*
**Functionality-Overall**5%
*“Didnt work no good”*
**Instructions/User Manual/Troubleshooting**3%
*“no instructions as to where to water”*
**Product Condition**3%
*“good used”*
**Thickness**3%
*“Very thin”*
### **Top return reasons **
**Leak-Proof**39%
**Size-Overall**17%
**Advertised Vs Actual Product**11%
**Functionality-Overall**7%
**Value For Money**6%
**Plant Growth**6%
**Product Condition**3%
**Defective Material/Parts**2%
**Contamination**2%
**Moist/Dry**1%
## **Common questions**
- **Is phosphorus and potassium fertilizers profitable to sell on Amazon United States?**
- The niche generates $57K/yr across 10 tracked products. 90-day search growth is +266.5%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the phosphorus and potassium fertilizers niche?**
- 7 brands and 28 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 95% of demand.
- **What do buyers complain about in phosphorus and potassium fertilizers?**
- Top complaints mined from reviews: Plant Growth, Size-Overall, Leak-Proof. The return rate is 0.3%.
- **What does it cost to enter the phosphorus and potassium fertilizers niche?**
- Listings span $11.85–$29.80; the average listing price is $19.63 (sweet spot $15–$100). The average incumbent carries 2,867 reviews — the moat a new listing must climb.
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