The other day, while sorting out some old papers, I found an article in a gardening magazine from ten years ago, listing the three major changes we should…
Grow in full sun.
By division of rhizomes or offsets in late summer or by seed in autumn. Certain cultivars should be propagated by division only.
Pests, diseases or disorders
Slugs, snails, thrips, aphid borne viruses, bacterial soft rot and Botrytis.