Cold hardiness of potted plants left outdoors in winter

Diane Whitehead
Mon, 08 Oct 2012 19:28:56 PDT
On 8-Oct-12, at 6:34 PM, penstemon wrote:

> To quote the article by Alun Rees (in The New Plantsman): "Plants  
> growing in
> containers such as large pots, urns, and jardinieres appear less  
> resistant
> to cold than those growing in soil nearby. This is because the growing
> medium is cut off from the upward heat transfer from the ground

One very cold winter here, potted plants on wire shelves in a  
hoophouse froze and died, but some potted plants left outside on the  
ground, close together, survived.  They were in thin-walled regular  
plastic pots, and were on soil, not on concrete.

Diane Whitehead
Victoria, British Columbia, Canada
cool mediterranean climate
moderate dry summers, moderate rainy winters
68 cm rain (27 in)

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