Yes, it's time to chop down the lovely Windflowers: they've been wonderful this year, but now the flowers are over, and the foliage is going brown, so it's…
Shelter from excessively wet conditions in the winter.
By division of established clumps in early spring and autumn or by root cuttings.
Pests, diseases or disorders
Slugs, caterpillars, powdery mildew.