On Aug 16, 2016,
Reziac from Laurel, MT wrote:
Billings, Montana area, zone 4... it surprised me, all right. House sat empty and neglected for 3 years before we got it, so it dates back to before that. Last March it grew a big clump of leaves that died back by June, and that was the last I saw of it. This year it did the leaves again, died back, and suddenly now in mid-August it's sent up 7 big flower stems and is blooming like crazy.
The spot it's in gets VERY hot and dry in summer (only other thing that will grow there is bearded iris, and hyacinth in early spring; during summer everything else struggles).
This is supposed to be a tender bulb not hardy past zone 6, but no one told it. Two winters ago it was -30F here. It leafs up while there's still snow on the ground and getting hard freezes every nigh
http://davesgarden.com/guides/pf/go/517/#t.
Next year I think I'll try spreading the offshoot bulbs (the mature bulbs are huge, 4" across) to other problem spots where nothing wants to grow.