Posted: 10/10/2017 at 11:58
Many of the tall Alliums are natives of the Russian Steppes. So they actually grow in Autumn and early winter. The leaves are frost proof so when, if, we get a cold spell it will do them no harm. They actually flower after the leaves have finished their job. If you feel the need to feed them, then now while they have green leaves is a good time to give them a foliar feed.