When to plant Zinnias in Bath

Sow seeds in modules around 17th April - 1st May, 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 1st May - 22nd 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 15th May to 29th 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 29th May - 12th June 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 29th May to 2nd 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 12th June - 10th July, 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 10th July to 2nd 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.