When to plant Zinnias in Brighton

Sow seeds in modules around 3rd April - 17th April, about 1 cm deep in fine compost. Keep them warm and bright, and water lightly so the compost stays just moist.

Pot seedlings on around 17th April - 8th May, as soon as they have their first pair of true leaves. Move them into individual small pots so the roots do not become cramped, and keep them warm in good light without overwatering.

Harden plants off over 15 days before planting out, from 1st May to 15th May. Put them outside during the day at first, then bring them in at night until they cope with cooler air and brighter sun.

Plant out around 15th May - 29th May into fertile, free-draining soil in a warm, sunny, sheltered position, spacing plants 30 cm apart. Water in thoroughly straight away, and protect young plants from slugs.

From 15th May to 11th November, water at soil level during dry spells and avoid wetting the leaves, as damp foliage encourages fungal disease. Once flowering begins, feed plants in containers with a high-potash liquid feed according to the label.

Around 29th May - 26th June, pinch out the main growing tip above a pair of leaves when plants are 20–30 cm tall to encourage branching. Support tall cultivars with canes or netting before the stems become top-heavy.

Every 14 days from 26th June to 11th November, cut flowers for the house or remove fading blooms back to a leaf joint. Regular cutting and deadheading encourage the plants to keep producing flowers until frost.