Well, we've enjoyed them tremendously, but now the flowers are over, and the foliage is starting to turn brown and drab - particularly on my favourites, the…
They are fully to frost hardy and will prefer little or no shade with deep, moist, well-drained soil. You should sow the seed in spring or autumn.
Sow in spring, thin out seedlings to 30cm. Prune Oct-Dec.
Pests, diseases or disorders
Downy mildew on undersides of leaves. Pull off and burn affected leaves.