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Sempervivum and jovibarbaSempervivums, or houseleeks, are hardy, succulent, alpine plants that grow in the wild between rocks in mountainous regions. We picked out ten of the best varieties at BBC Gardeners' World Live 2009.Sempervivum means 'always

30cm (12in) or more.This aquatic perennial should be divided annually to maintain the striking green and white horizontal variegation of its foliage. When dividing only replant the most vigorous sections. Plant with 5cm (2in) of water above the crown

less-hardy restios during cold spells. Wrap plants with a layer of horticultural fleece or cover the crown with a deep layer of mulch.How to grow restiosLearn more about restiosSee the RHS guide to cultivating restiosTrevena Cross Nurseries have over 50