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  • Japanese Indigo Persicaria Tinctoria Polygonum Tinctoria seed
  • May include: A bunch of green leafy plant cuttings with stems and roots. The cuttings are arranged on a light gray surface.
  • May include: A bunch of green plant cuttings with white roots. The cuttings are about 10 inches long and have small green leaves. The roots are about 4 inches long and are white and fibrous.
  • May include: Two skeins of yarn, one light blue and one green, are hanging from a wicker basket. The yarn is soft and fluffy, and it would be perfect for knitting or crocheting.
  • May include: Close-up of a green plant with a single leaf showing signs of damage, possibly from a pest or disease. The leaf is partially brown and has a light blue discoloration.
  • May include: A person's hands are squeezing a ball of teal blue yarn with green leaves mixed in. The yarn is in a stainless steel bowl.
  • May include: A close-up of a hand with all five fingers stained a dark blue color. The hand is resting on a light blue fabric with a floral pattern.
  • May include: A close-up of a bowl filled with a large clump of blue yarn. The yarn is tangled and has small green leaves mixed in.
  • May include: A glass jar filled with a blue powder. The jar has a gold lid and is sitting in front of a green plant with pink flowers.
  • May include: A close-up of a green leafy plant with pink flowers. The plant is growing in a garden setting.
  • Japanese Indigo Persicaria Tinctoria Polygonum Tinctoria seed
  • May include: A bunch of green leafy plant cuttings with stems and roots. The cuttings are arranged on a light gray surface.
  • May include: A bunch of green plant cuttings with white roots. The cuttings are about 10 inches long and have small green leaves. The roots are about 4 inches long and are white and fibrous.
  • May include: Two skeins of yarn, one light blue and one green, are hanging from a wicker basket. The yarn is soft and fluffy, and it would be perfect for knitting or crocheting.
  • May include: Close-up of a green plant with a single leaf showing signs of damage, possibly from a pest or disease. The leaf is partially brown and has a light blue discoloration.
  • May include: A person's hands are squeezing a ball of teal blue yarn with green leaves mixed in. The yarn is in a stainless steel bowl.
  • May include: A close-up of a hand with all five fingers stained a dark blue color. The hand is resting on a light blue fabric with a floral pattern.
  • May include: A close-up of a bowl filled with a large clump of blue yarn. The yarn is tangled and has small green leaves mixed in.
  • May include: A glass jar filled with a blue powder. The jar has a gold lid and is sitting in front of a green plant with pink flowers.
  • May include: A close-up of a green leafy plant with pink flowers. The plant is growing in a garden setting.
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Japanese Indigo Seeds - Persicaria Tinctoria Seed Polygonum tinctorium Seeds Dyers Knotweed Blue natural dye garden plant

What to know

Materials

seed, seeds, dye, natural, plant, japanese, indigo, persicaria, tinctoria, polygonum, tinctorium, dyers, knotweed

100+ seeds per packet.

Japanese Indigo seeds grown and harvested here in my gardens. Persicaria tinctoria and Polygonum tinctorium are both Japanese Indigo. Japanese Indigo is also called Dyer's Knotweed.

Japanese Indigo produces a blue dye.

Japanese Indigo is a very easy to grow plant, so it is often grown in cooler climates where true indigo, (Indigofera Tinctoria) cannot be grown because it needs a very warm, long season. It is a smart weed, as it grows and roots readily from nodes on the stem. As you see in the pictures, you can harvest the stems before they bloom and strip off the leaves to dye with them, and then sit the stems in water and they will quickly root and can be planted again and will flower to produce seeds.

Japanese indigo will self-seed readily if you leave the area undisturbed. This is a round leaf Japanese Indigo which has been found to be hardier to heat than the longer, narrow leaved Japanese Indigo. It grow much more quickly and flowers more quickly than the narrow, long leafed Japanese Indigo variety, which can take so long to flower and produce seeds if it is harvested, that in cooler climates, it may not flower and produce seeds until close to the first frost.

You can dye yarn with Japanese Indigo simply by squushing the leaves with salt and adding yarn. It really is that easy! You can see the yarn that I dyed that way in the pictures, and how blue my hands are! The one picture shows how quickly and well, the cut stems that are stripped of leaves will root.

Sow and cover lightly or just press into the soil. Germination is 10-21 days. Plant in full sun.

Seeds cannot be shipped outside of the US.

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What buyers say

Summarized by AI from all item reviews

4.9 (55)
Fast shipping Love it Great quality Helpful seller Healthy plant Clear instructions Well packaged
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Price:$5.99

Shipping & return policies

  • Order today to get by Aug 6-10
  • Returns & exchanges accepted within 30 days.
  • Ships from: Carlisle, PA
  • Cost to ship: $2.99
  • Deliver to United States, 43215

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Reviews for this item

4.9

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.

(55 reviews)

4.9 Item quality
4.9 Shipping
5.0 Customer service
100% Buyers recommend

What buyers say

Summarized by AI from all item reviews

Fast shipping Love it Great quality Helpful seller Healthy plant Clear instructions Well packaged

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5 out of 5 stars 5

Jane Jul 26, 2026

Growing like crazy. Can wait to make soap using it.

Jane Jul 26, 2026

5 out of 5 stars 5

Xial Apr 27, 2026

Great packaging! Thank you so much! I appreciate the notes on tips for planting these seeds!

Xial Apr 27, 2026

5 out of 5 stars 5

Cathy Mar 17, 2026

Can't wait to plant & dye with this

Cathy Mar 17, 2026

5 out of 5 stars 5

Sarah Mar 10, 2026

Package arrived on time, thanks!

Sarah Mar 10, 2026

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