Coriander The dried seeds have spicy aroma. This variety was bred for seed production but the leaves can also be used. Use for authentic curries and oriental dishes. Sow outdoors thinly, from March to June, where they are to crop, 1.5cm deep, directly into finely-prepared, warm, well-drained soil, which has already been watered. Seedlings usually appear in 14-21 days. Thin seedlings to 20cm apart. Water well until plants are established. For a continuous supply, make sowings at two to three week intervals. Leaves can be harvested, but this will decrease seed crop. Can also be sown and grown on a light windowsill, but for leaf only - seeds will not ripen indoors. Harvest from June to October. Pick the seed heads when they turn light brown. They have a pleasant, spicy aroma when ready for harvesting. After drying, shake out the seeds and store in an airtight container.