Start seeds in pots 4/15-5/31 (using a heating mat will speed up germination). Days to germination: 7-30 days. Transplant outside 5/15-7/15 spaced 12" apart or more. Plant in full sun in well drained soil.
In the second year of growth, Madder produces yellow, star-shaped flowers that signify that the roots are ready to use for dye. Dig roots with a garden fork and wash them. Use for dye fresh or dried.