Stonecrop species with white foliage
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I like Sedum spathufolium; it's compact and slow growing, plays well with others, and if you're very lucky, it will produce some vivid yellow flowers for you.
Grow this in well drained soil - in it's native habitat, it grows right on top of granite rocks. Use in containers, it makes a great foil with other types of Sedum and Sempervivum.
Look at the other two great cultivars that it's parented; Sedum spathufolium 'Purpureum' and Sedum spathufolium 'Capo Blanco'.
Sedum Plant List