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Winter hardy cacti query


Guy
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My new(ish) greenhouse has some space for a few cacti.

The greenhouse is frost free, with a heater keeping the temperature to above 4°C in the winter.

The cacti in my local gardening centre all say 'keep above 10°C', when they say anything!

What can you suggest, please?

Thanks.

Guy

Edited by Guy
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Many cacti will survive sub-zero as long as they are completely bone dry.  I overwinter a few in my greenhouse and I only keep it frost free - zero deg C if I can, once or twice minus a few!

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