Coriander

Coriandrum sativum

Coriander leaves (cilantro) are ready fast and the seeds come later. In heat or dry soil the plants soon shoot up and flower. So sow a small batch every month or so from spring, rather than one big sowing. It grows well in a pot.

Looking after it

Water: It needs a normal amount of water. In dry spells keep the soil moist, because dry roots make it flower early. In warm weather, check pots every day. Feeding: Coriander needs very little. It's a quick crop, so garden soil or fresh compost is enough without any feed.

Picking and keeping

Start cutting leaves when the plants are 10 to 15 cm tall. Take a few from each plant, then give them about two weeks to grow back. For seed, let some plants flower. Cut the stems when the seeds turn brown and dry them in a paper bag. A fresh bunch lasts a few days in the fridge. Dried seed keeps for months in an airtight jar.

What can go wrong

Bolting. In hot, dry weather or after being moved, the plants send up a flower stalk and stop making leaves. Sow the seed where the plants will grow, in a spot with shade at midday. Water in dry spells and choose a variety that is slow to bolt.
Slugs and snails. In damp weather they eat the seedlings. Go out after dark and pick them off.
Aphids. Small green or black insects crowd onto the shoot tips and weaken the plant. Rub them off or wash them away. Leave ladybirds alone, as they eat them.

Growing facts: RHS, UC ANR and seed-company sowing guides. Coriander care: RHS. pH: University of Connecticut extension. Pot size: Oregon State extension.