List of potentially cold-hardy aloes

This list has been cobbled together from information in the Silverhill seed catalogue and background research into aloes. I have included any species that has had a reference to tolerating cold - the amount of cold remains to be seen. Silverhill have usefully added USDA hardiness zone ratings to their catalogue entries - I have added these where appropriate.

Aloe aculeata z9
Aloe arborescens z9
Aloe boylei z8
Aloe brevifolia z9
Aloe broomii z8
Aloe castanea z9
Aloe chortoliriodes
Aloe cooperi z8
Aloe dominella z8
ALoe dewetii
Aloe dyeri
Aloe ecklonis z7
Aloe ferox z9
Aloe fosteri z8
Aloe gerstneri z9
Aloe grandidentata z8
Aloe greatheadii and var davyana z8
Aloe humilis z8
Aloe immaculata
Aloe kniphofioides
Aloe maculata z8
Aloe marlothii z9
Aloe mutabilis (possibly a high altitude form of A.arborescens)
Aloe nubigena
Aloe peglerae z9
Aloe plicatilis z9
Aloe pratensis z7
Aloe reitzii z7
Aloe reynoldsii
Aloe soutspansbergensis
Aloe speciosa z9
Aloe spectabilis (northern form of A. marlothii)
Aloe spicata
Aloe striatula z7
Aloe suprafoliata
Aloe umfoloziensis
Aloe vanbalenii
Aloe vryheidensis

Now all we need to do is find them.......

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