Germinating Indigo Seed

Seeds of the indigo plant Persicaria Tinctoria are smooth shelled, glossy dark brown, approximately tear drop shaped and measure around 3mm in length. Seeds counts range between 400-700/g depending on varietal.

Notes on Germination Soil

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This damp mix is composed of a blend of soil, sand and vermiculite. It drains well and does not clump. When transplanting from this container into the seedlings' final home, the soil breaks apart easily and does not tear smaller fibers of fresh root growth. When germinating in flats, 2" of soil depth is adequate.

Germination Depth

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Rows Pressed Into Damp Soil

Persicaria Tinctoria seeds can germinate at a range of depths from surface sewing to over 1/2" in depth. For optimum root and cotyledon stability, the ideal sowing depth is 1/8" to 1/4". To achieve this easily, press rows into the soil at 1/2" depth and sprinkle seeds into the crevices, then cover with damp soil mix and gently press the surface of the soil.

On Moisture

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Indigo, like other members of the Persicaria and its previously classified Polygonum genera, both tolerates and thrives in damp soil. This is especially true during germination. The seeds will fail if subjected to dry conditions when in tender germination stages. They can be germinated in full sun as long as the high soil moisture level is retained. As the seedlings grow larger and have more established root systems, they can tolerate a larger range of soil moisture conditions.

Seedling Density

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During the germination process, the indigo seeds can be tightly packed together. There can be up to 50 plants germinated per row with no complications as long as the seedlings are separated before becoming rootbound within their container. This is typically at around 3-4 true leaves of growth when the plant is approximately 2" tall. Depending on the weather conditions, this point can be reached in between 5-8 weeks.

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Seedlings ready for transplant.