Is japanese knotweed profitable to sell on Amazon United States?

The niche generates $118K/yr across 21 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +24.3%. Flapen's verdict: Worth a look (58/100).

How competitive is the japanese knotweed niche?

17 brands and 469 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in japanese knotweed?

Top complaints mined from reviews: Dosage, Side Effects, Advertised Vs Actual Product. The return rate is 0.0%.

When does demand for japanese knotweed peak?

Demand peaks in May–Jun; the busiest month runs 1.6× the quietest.

What does it cost to enter the japanese knotweed niche?

Listings span $10.16–$45.00; the average listing price is $28.03 (sweet spot $15–$100). The average incumbent carries 386 reviews — the moat a new listing must climb.

Japanese Knotweed

Worth a look

Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Incredible$28.03

avg listing price — sweet spot $15–$100

Price range

Great$10.16–$45.00

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

Review moat

Great386.38

avg incumbent reviews — the moat a new listing must climb

Conversion

Great7.0%

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

Brand share

Good72%

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

Growth

Good+24.3%

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

Competition

Okay56%

top-5 click share — leaders hold, buyers still browse

Market size

Okay$118K

$118K/yr · 60K searches

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Is japanese knotweed profitable on Amazon?

According to Flapen's Amazon United States niche tracking, japanese knotweed is a $118K/yr Amazon United States market (60K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in May–Jun. Verdict: Worth a look — 58/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

japanese knotweed market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 4K–5K; avg 100–250/product
Revenue / yr: $112K–$140K; units × avg price
Conversion rate: 7.0%
Avg BSR: #1,492
Page quality: 0%
Prime: 100%
Sponsored: 86%
Out of stock: 0.3%
Avg brand age: 78 months
Avg seller age: 187 days

Competition: brands, sellers & click share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 rising

Sellers

469

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

56%

Top 20: 99%

Open market

24%

Zenmen24%
PURE ORIGINAL INGREDIENTS17%
Supreme Nutrition Products15%
Nature Restore8%
Earthborn Elements8%
Green Dragon Botanicals4%

japanese knotweed demand & seasonality

Weekly Amazon search volume, last 101 weeks — +24.3% search growth over the last 90 days.

Peak months: May, Jun · busiest ÷ quietest = 1.6×

Open Trend

Top japanese knotweed search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

japanese knotweed45K/yr +29.9%7.4% conv.
knotweed6K/yr +59.1%4.7% conv.
itadori extract4K/yr -10.5%4.0% conv.
japanese knotweed capsules4K/yr -31.0%7.3% conv.

All search terms

Top japanese knotweed products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

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

Top sellers

by 90-day click share

Supreme Nutrition Japanese Knotweed Supreme 120 Pure Polygonum cuspidatum Vegetarian Capsules

Supreme Nutrition Products$38.834.6★326 rev

Zenmen Japanese Knotweed Premium Resveratrol USDA 3rd Party Tested Tincture 60ml/2.32 Oz - 1:3 Clinical Strength Ratio - Tick Wellness Aid and Immune Support Supplement - Made in The USA

Zenmen$35.394.5★146 rev

Zenmen Tick Immune Support Supplement - Improved Formula - Japanese Knotweed Cats Claw Chinese Skullcap Cryptolepis Sanguinolenta Sweet Wormwood - 90 Vegan Capsules Made in The USA

Zenmen$37.984.6★587 rev

Nature Restore Japanese Knotweed Extract Powder (8 oz). Natural Trans-Resveratrol for Longevity Sirtuin Activation & Cellular Aging. Also Known as Polygonum Cuspidatum

Nature Restore$26.804.2★435 rev

Earthborn Elements Japanese Knotweed Extract 200 Capsules

Earthborn Elements$15.914.5★140 rev

Newest

by launch date

NutraMedix Japanese Knotweed Supplement - Natural Source of Resveratrol & Polyphenols for Broad-Spectrum Microbial & Tick Immune Support - Bioavailable Antioxidant & Heart Health Tincture (2 Fl oz)

NutraMedix$45.003 rev

6mo ago

BLIVA Tick Immune Support Supplement - Japanese Knotweed Cats Claw Chinese Skullcap Cryptolepis - Advanced Tick Herbal Complex Formula - 90 Vegan Capsules

BLIVA NUTRITION$27.7941 rev

1y ago

Itadori Tea - Organic Black Tea With Japanese Knotweed For Resveratrol & Immune Support Antioxidant-Rich All-Natural Ingredients 14 Tea Bags for Holistic Wellness

Itadori Tea$24.9846 rev

1y ago

PURE ORIGINAL INGREDIENTS Japanese Knotweed (8 oz) Hu Zhang Fen Traditional Supplement

PURE ORIGINAL INGREDIENTS$15.0457 rev

2y ago

Zenmen Japanese Knotweed Premium Resveratrol USDA 3rd Party Tested Tincture 60ml/2.32 Oz - 1:3 Clinical Strength Ratio - Tick Wellness Aid and Immune Support Supplement - Made in The USA

Zenmen$35.39146 rev

2y ago

What reviews say buyers love and hate about japanese knotweed

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

What buyers love

Quality-Overall21%

“Excellent product”

Taste-Overall12%

“Delicious tea”

Ease Of Chewing/Swallowing9%

“Easy to drink”

Fever Relief7%

“Helping my horse remain in remission from Lyme disease”

Ease Of Use5%

“Useful”

Value For Money5%

“Good price”

Efficiency4%

“seam working good”

Skin Health3%

“Great for health”

Ingredients-Overall3%

“It's nice to have these powerful herbs together”

Advertised Vs Actual Product2%

“Just what I needed”

What buyers complain about

Dosage16%

“it's way worse if I miss a dose”

Side Effects10%

“Feel no effects personally”

Advertised Vs Actual Product8%

“I feel the packaging is very misleading”

Ingredients-Overall8%

“This is not root powder as the packaging says”

Value For Money6%

“Waste of money”

Adhesion/Stickiness6%

“sticky”

Vitamin6%

“Only take this supplement every now and than so I can't you if it works are not,,feel nothing different”

Regulates Digestion6%

“kidneys are overloaded that can lead to other issues”

Ease Of Use6%

“so I can't use all of it”

Vegan/Organic6%

“the polygonum cuspidatum root extract not organic anymore”

Top return reasons

Ingredients-Overall100%

Common japanese knotweed questions

Is japanese knotweed profitable to sell on Amazon United States?: The niche generates $118K/yr across 21 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +24.3%. Flapen's verdict: Worth a look (58/100).
How competitive is the japanese knotweed niche?: 17 brands and 469 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in japanese knotweed?: Top complaints mined from reviews: Dosage, Side Effects, Advertised Vs Actual Product. The return rate is 0.0%.
When does demand for japanese knotweed peak?: Demand peaks in May–Jun; the busiest month runs 1.6× the quietest.
What does it cost to enter the japanese knotweed niche?: Listings span $10.16–$45.00; the average listing price is $28.03 (sweet spot $15–$100). The average incumbent carries 386 reviews — the moat a new listing must climb.