Sweet rocket

A packet of sweet rocket seeds is likely to produce flowers varying in colour from deep rich purple, through all the paler lilac shades to white - leave them to seed themselves, and they will maintain this diversity indefinitely, gradually naturalising over a large area. The fragrance is as sweet as a violet's, and most pronounced in the evening (the night-scented stock is a close relative). It will look good in a border especially in a cottage garden and is attractive to wildlife.