Corydalis
Bill and Dean,
I can't keep the blue species going, either. Don't know if it's the
clayey soil, poor drainage, or zone 6 winters here in coastal CT, but
they didn't perform that well during the growing season, either. Well,
at least I can stop berating myself for not succeeding with them.
I'd really like to find a source of Corydalis cashmeriana, although
that's not easy to grow, either. Here's what Woods says:
"C. cashmeriana. [From] Kashmir. Height 6 in.; spread 9 in. A very
beautiful plant with a delicate filigree of blue-green leaves and
clusters of 1-inch-long, clear blue flowers throughout the summer. A
difficult but desirable species to grow, best cultivated in an alpine
house or in a climate with cool summer nights. Zones 5-6"
In my garden, C. lutea (yellow) self-seeds and spreads like crazy,
and although my Dh disagrees with me, I think it's an attribute, given
its long bloom period. It's easily yanked out, and you don't have to
feel bad about yanking out perfectly healthy plants. They'll come back,
even in the compost heap!
Janet
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