INDIGO SEEDS

Indigofera tinctoria

Tender old world perennial, historically used interchangeably with I. suffruticosa. Common source of blue dye throughout much of the tropical and subtropical zones for many thousands of years. Moderately easy to overwinter indoors in cold northern zones.

Like other tender perennials, indigo can be grown in a large container and overwintered indoors. It is not hardy and will not tolerate frost, but will take quite a bit of abuse as long as it is kept from freezing.

Start seeds indoors several weeks before the last frost: lightly scarify and soak seeds overnight in warm water; sow at least five seeds about 1/4" below the surface of moist soil in deep 3" containers, pressing to keep seed snug. Mist generously with warm water and cover with plastic. Kept warm (75°F) and moist in bright light, seeds will usually germinate within a few weeks. Thin to a single plant per container. Grow on in bright light and warm temperatures. The young seedlings can seem quite small and sickly to start, especially in cool temperatures or part shade. Transplant carefully into larger containers as needed, without disturbing the roots. Transplant into good garden soil in full sun when nights are at least 55°F and soil temperature is at least 65°F. Plants are very sensitive to cold.

Mature plants can become quite large, growing up to 6' if not harvested frequently. For dye, harvest just as they come into flower, when they will have the highest concentration of pigment in their leaves. Up to three harvests may be had each season from mature plants. Strip leaves for dye bath and dispose of the useless stems. Proceed with dyemaking.

Packet contains at least 30 seeds.