Erysimum

Wallflower seeds are sown from May to July.

You can grow wallflowers from seed directly outside in the ground. Choose a sunny position with good, well-drained soil. Sow thinly at a depth of 13mm (0.5in) deep in rows 30cm (12in) apart. Cover the seed with fine soil and water in well. Water regularly, especially during dry periods. When the plants are large enough to handle you can transplant them to their final flowering positions.

It is usually better to sow wallflowers indoors in seed trays, cell trays or pots of good seed sowing compost at a temperature of around 13-15C (55-65F). Put the container inside a polythene bag or propagator. When seedlings are large enough to handle, transplant them individually into pots and grow them on in cooler conditions before planting outdoors in their final flowering positions.

When the young wallflower plants are 12.5cm (5in) tall pinch out the growing point to make them bush out.