Watercress is a quick, leafy crop for cool conditions, producing crisp shoots with a lively peppery flavour. It is easily managed in a container rather than a streamside setting. A shaded patio or sheltered corner can provide repeated pickings through spring and summer.

When and how to sow

Sow thinly in module trays or directly into a large pot from April to August, covering seed only lightly. Use rich, moisture-retentive compost and stand the container in a tray or bucket of water. Alternatively, root fresh supermarket sprigs in water before potting them up. Choose light shade, especially in warmer southern gardens, and keep plants about 15 cm apart.

Care

Never allow the compost to dry out. Keep the pot standing in shallow water and change that water regularly so it remains fresh and cool. Pinch out growing tips to encourage branching, and make regular small harvests. In hot weather, move containers into deeper shade to delay flowering.

Common problems

Hot, dry conditions make plants run to flower and leaves become tougher. Stagnant, warm water can cause rotting stems, so refresh it frequently and remove decaying material. Slugs may feed on young leaves; check beneath pots and hand-remove them. Avoid gathering watercress from wild streams.

Harvest

Begin snipping young leafy shoots once plants are well rooted and growing strongly. Cut stems above lower leaves so they can regrow, taking small amounts regularly rather than stripping a plant. Harvest before flowering for the most tender leaves, and wash home-grown shoots carefully before use.

Growing Watercress: frequently asked questions

When should I sow watercress in the UK?

Sow thinly in module trays or directly into a large pot from April to August, covering seed only lightly.

What are common problems when growing watercress?

Hot, dry conditions make plants run to flower and leaves become tougher.

When is watercress ready to harvest?

Begin snipping young leafy shoots once plants are well rooted and growing strongly.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 19 Sep 2026.