Dormancy requirement for Hesperocallis undulata?

Gene Mirro
Wed, 18 Feb 2009 12:51:26 PST
I can germinate them and grow healthy plants the first season, then I let the soil dry out when the leaves yellow, and keep them warm and dry until winter.  I'm in Portland, Oregon, and I leave the potted bulbs out in the cold greenhouse, but I don't let them get colder than 40F.  In spring, I give them a good watering, since I read that triggers their spring growth.  But it doesn't work.  They won't break dormancy, even though the bulbs are sound.  Any idea what I'm doing wrong?  Too cold maybe?  Thanks.

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