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Re: Freezing temps

>To: R Reidy,

Thank you for your very interesting comments.

Ronald Leger
Bedford, Quebec  zone 5
----------------------------------- comment --------------------------

>The only Pelargoniums that are absolutely cold hardy in their habitats are
>the two unique species from West Asia.  They are sub-zero Fahrenheit
>(-17C and below) hardy.  A few southern African species that spread into
>the mountains of Lesotho, such a P. reniforme and P. sidoides, also handle
>very low temperatures--in culivation in my experience to at least 16F
>(-9C)--though I don't know if they can survive such temperatures
>for really long sustained periods. Zonals, however, are another matter.
>There are so many physiological and environmental factors involved. One of
>the problems is that zonals do not go dormant.   I know from my
>experience that some of them can survive a brief hour or two, such as
>encountered early in the morning, of temps as low as 22F (-6C), but they
>have their limits and I've never known one that survived being frozen
>solid and kept frozen for any period of time. Some of the recent Cliff
>Blackman hybrids with P. articulatum from Australia show excellent
>tolerance to cold temperatures in general and will survive and
>continue to grow after repeated light frosts.
*  rleger@email.com                      *
*  ICQ# 6561520                          *
*  http://www.total.net/~legerr          *

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