Posted: 10/03/2015 at 13:02
For me crocosmia do better with some extra watering in hot weather until established. And good soil ...
but, having said that I also grow Lucifer in pots ....I divide clumps to control their size.....where they flower well. My feeling is extra water in summer produces better flowering.
Truth is, Busy, I don't really know because they grow here wherever they are planted. "Physiological" issues...? Very cold weather, hard frosts, can kill crocosmia so perhaps that's what's happening to yours. Those corms are relatively surface growing, aren't they, so susceptible. Maybe some protection over winter?