When I planted the Lucifer Crocosmia in the fall of 2009, I had not yet bothered to check what zone the Ontario cottage was, I just figured it was close to zone 6 (Toronto), so it was probably zone 5.
The Crocosmia are not the only thing I planted at the cottage that was not meant for zone 4, but it is one of the few things out of its zone that has managed to not just survive, but to take off - it just took time. Funnily enough my neighbour in the city had a similar experience with his Crocs taking 3 years to really bloom well, and that was in zone 6.
So maybe it is just the nature of the plant?
For the first 3 years the leaves came up with no blooms, (from about half of the bulbs I had planted). Since I like the foliage so much, I left it and let it grow up around the base of the tree with the hammock attached.
It was interesting even if it didn't bloom.
2 years ago there were some blooms, but not many and they were scraggly, not like the vibrant ones above.
But this past summer they were there in all their glory.
Crocosmia is something I will miss now that I am in a zone 3, but I have a feeling that I may just try them one day here anyway, afterall people here say it is not so hard to push to zone 4...