Persicaria tinctoria / Polygonum tinctorium likes a neutral, well-drained soil, full sun, and weekly watering. This is the first of two posts on how I start and transplant indigo. It is not the only way – seeds could be started in flats or directly in planters/pots, etc. There’s really no right or wrong so long as your indigo gets lots of sun, enough water and fertilizer.
Start seeds in greenhouse 5-6 weeks before last frost date for earliest outdoor planting – late March for us.