For late spring colour in beds, borders and containers, wallflowers take some beating either on their own or interplanted with tulips. Their delicate scent is lovely on a warm spring day. Wallflower plants will be available to plant into the garden in September and October, but they can also be grown very easily from seed. Sow seed thinly in seed trays of compost, or outside in a shallow drill. When seedlings are a few inches tall they can be transplanted to grow on in the garden, ready for autumn, when they can be planted in their permanent position.