Mid-Atlantic Gardening: The Skinny on Alstroemeria?, 0 by Pollygardening

Pollygardening wrote:
In my flower arranging, I am now using blue Asiatic Iris, daffodils, forsythia and sweet bay magnolia, but the daffodils & Iris are gone in three days or so. But never the added white Alstroemeria - it lasts and lasts, and its colors are spendid. Some folks turn up their noses, but I sure like to do an arrangement and have it fresh a week later!
They are hardy to zone 7 and like sun - do they bloom all summer here?
Anyone have a good source or plants to trade? I would be happy to trade some of the Brugmansia rooted cuttings I have in my grhouse, or potted plants in exchange for some.