Cold hardiness of potted plants left outdoors in winter

J. Denys Bourque
Fri, 05 Oct 2012 16:13:37 PDT
Jim McKenney <> writes : 

"One thing to keep in mind in this discussion [on how to overwinter Nerine bowdenii] is that in some plants 
roots are evidently less cold hardy than the upper parts of the plant. 
Conifers hardy in the ground well up into Canada sometimes die during 
our comparatively wimpy winters when grown in pots above ground. ... I've had bulbs of Lilium regale, ordinarily a very hardy and reliable 
plant, die when grown in pots left above ground during the winter. I 
have no idea what the explanation for this is"...

I suspect that dessication due to wind effect may be the cause that plants in pots left to overwinter outside die, particularly if snow cover is lost.

J. Denys Bourque
Saint-Jacques, NB   CANADA

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