Colchicum in cold climates
Fri, 27 Jul 2012 12:44:40 PDT

I have a lot of colchicums that thrive here in Zone 6/7. Among them are cultivars of C. autumnale as well as C. agrippinum, C. bivonae, and C. speciosum. They are all listed as being hardy in Zone 4 if the drainage is good. Mine grow with the shoulders of the bulbs only 2-3 inches below the soil. If one wanted to grow them in Zone 4 or colder, would deeper planting make them less vulnerable to the cold? Would they tolerate deeper planting? 

Advice would be appreciated, 

Best wishes, 


Dell Sherk, SE Pennsylvania, USA 
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