x Alworthia 'Black Gem' is one of horticulture's oddities: often listed as Aloe 'Black Gem', it is a bigeneric hybrid between Aloe speciosa and Haworthia cymbiformis. It generates many tight offsets, creating a large low clump and the foliage varies from green through to dark reddish-bronzy purple with the thick triangular-conical succulent leaves becoming darker and redder the more sun it gets.
In the UK, x Alworthia 'Black Gem' can be grown outside in the summer but in most regions - despite it being relatively cold-tolerant - will need to be brought indoors for the winter. A window-sill is perfect but a cold unheated greenhouse under fleece is also fine.
|Synonyms||Aloe 'Black Gem'|
|Geographical Origin||Horticultural origin - parent plants from South Africa|
|Cultivation||Full sun to occasional shade. Gritty, very well-drained substrate. Protect from frost|
|Hardiness||Tender in the UK in all but the most favourable south coast or inner London locations|
BeautifulA big healthy plant. I can't wait to put her in the sun to bring out her great colours!
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