Colchicum in cold climates

Jane McGary
Fri, 27 Jul 2012 17:34:14 PDT
Dell asked,

>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 4Â or colder, would deeper planting 
>make them less vulnerable to the cold? Would they tolerate deeper planting?

I don't plant my colchicums very deep, but once I 
rescued some C. x agrippinum (which turned out to 
be a different clone from the one usually grown) 
from an old Portland garden where they had become 
buried as much as 18 inches (about 50 cm) deep by 
repeated floods. They were thin and elongated, 
but they were still flowering, and when I got 
them into the garden they flourished.

Jane McGary
Portland, Oregon, USA

More information about the pbs mailing list