Mary Sue Ittner
Mon, 12 Oct 2015 19:42:25 PDT
Crocosmias increase many different ways and for 
that reason are considered to be invasive by 
many. Crocosmia × crocosmiiflora has become an 
exotic weed in places that remain wet in 
California in the summer (drainage ditches, 
watered gardens.) As Vivien has pointed out the 
old corms do not shrivel away, but I believe only 
the top corm probably produces a flower. David 
Pilling has added a photo of stacked corms on the wiki.…
But if you are trying to get rid of them (I'm 
experienced with this) and think you have gotten 
all of them out, you may have just pulled the top 
corms off and what is left is capable of blooming 
once the newer corm is removed. When I lived in a 
warmer sunnier summer location I tried to get all 
of them out of perennial beds when they were 
taking over and the next year there were still 
leaves and flowers. So perhaps this was one way 
of keeping them in hand. As Vivien also noted, 
the corm sends out runners in more than one 
direction and each runner creates new corms as it 
runs. The new corms probably have to get a 
certain size before they bloom, but I don't know how big that might be.

I should have taken a photo of the runners for 
the wiki the last time I dug them out. In my dry 
and shady summer garden they don't bloom much, so 
I'd just have a lot of leaves and no flowers if I 
left them and in time more and more of them so I 
dig them out. And when I think they are all gone, 
in later years I find them again so obviously I 
didn't get them all. I don't know if all the 
species and cultivars behave in this same way. 
Photos on the wiki from David Pilling show some 
large flowering clumps. I wonder how many corms there are in that patch.

Mary Sue

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