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Re: Corydalis

Amber & Wayman Hearn wrote:
> 
> I'm by no means an expert on the genus Duncan, but I do love most of them
> that I've grown. I must beg to differ with you on the tubers. Some species
> do form tubers, others roots. They are highly variable. Some are winter
> annuals (technically biennials or monocarps I suppose) and some are
> perennial. Many of the annual species are weedy and reseed terribly. The
> perennial species, especially the tuberous ones, form large colonies.
> 
> The tuberous rooted species are easily propagated by division if you can
> obtain parent plants. Here in the US I've had trouble finding many of them.
> The hybrids must be propagated by division as they will not come true from
> seed. The problem is that some nurseries are selling seed grown versions of
> the hybrids that are inferior. Do be careful in making purchases.
> 
> Alternatively, the species may be propagated from seed. Seeds of most of the
> species are either short-lived, or go into deep dormancy if not sown fairly
> fresh from the plant. Seedlings will appear from freshly sown seed either in
> the autumn of the same year or the following spring if sown out doors. If
> sown indoors, they may need to be subjected to cold to induce germination.
> 
> If all you can obtain is older seed, sow it anyway and give it alternating
> cycles of warmth and cold. I've had good luck by using oscillating
> temperatures. IE. - put the dry stored seeds in the refrigerator and bring
> them out to room temperature for a few hours every three days or so for a
> few hours and then return them to the fridge. Extend the warm period
> gradually to simulate the warm up of spring. If this doesn't work for you in
> a few weeks, leave them warm for three months or so and repeat the process.
> Keep trying. It may take a year or more, but if the seeds are good they will
> eventually germinate. If this sounds like too much work, just sow the seeds
> in a pot, cover with grit and put them outside in a protected area, keep
> watered and wait. Usually they will germinate eventually. I've had them
> germinate outdoors after two years in pots.
> 
> Be wary of the following species - they are weedy reseeders: C. sempervirens
> (Rock Harlequin), C. lutea (Golden Fumitory)and C. flavula. There are
> undoubtedly others but I've been lucky enough not to get a hold of them.
> 
> Grow well,
> Amber
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> Amber & Wayman Hearn                    jadare@accessus.net
> Whippoorwill Creek Nursery              USDA Z-5
> 943 Foxville Road                       mintemp = -15F/maxtemp = 102F
> Kell, IL 62853
> 618-822-6000
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Golden Fumitory, eh?  I am now suspect of something I purchased for
growing on for resale.  It's Adlumia fungosa.  It also has the beautiful
lacy foliage, is a shade over, and I read that it is biennial.  Is this
related to a corydalis?  Information is hard to come by under "Adlumia".
References:
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