The herb seed called coriander and the herb leaf called cilantro grow from the same plant. Coriander is a warm-weather annual. Sow coriander in the garden in spring 2 to 3 weeks after the last expected frost date. Coriander requires 75 days or more to reach harvest; for seed harvest allow 100 days.
Description. Coriander is a frost-sensitive annual with feathery, finely divided leaves growing on stems from 18 to 36 inches tall. Coriander leaves, known as cilantro, resemble flat-leafed parsley. Blossoms in spring and summer are tiny white to pale pink flower clusters. The plant sets small round, ribbed, beige-colored seeds in late summer.
Yield. Grow one to two coriander plants per household. Plant successive crops every two weeks for a continuous supply or cilantro leaves.
Site. Plant coriander in full sun; it will tolerate light shade. Coriander grows best in well-drained but moisture-retentive soil rich in organic matter. Prepare planting beds in advance with aged compost. Coriander prefers a soil pH of 6.0 to 6.7.