Coriander/cilantro is a fast-growing, aromatic herb that grows in the cooler weather of spring and fall. This herb is used to flavour many recipes and the entire plant is edible. The leaves are called cilantro and the seeds are called coriander. it is best to chose a sunny site that will allow cilantro to self-seed as it is ought to do. Keep picking mature leaves as and when you need them. Regular cropping should delay flowering. Once the plants do flower, allow them to set seed. The seed is ripe when it stops smelling unpleasant. Collect it and use in cooking, keeping some to sow for another crop.