PlantFiles: Stonecrop
Sedum album 'Chubby Fingers'

Best grown in full sun to keep it compact, starts to ramble and show bare areas if too much shade. Spreads steadily by itself, and easily multiplied by scattering chopped bits of plants about. Best in well-drained poor sandy soil. Potentially invasive, generally overruns other small Sedum and Sempervivum. Easily controlled by weeding back the edges of clumps. Great plant to quickly fill up a large area in a rockery, afterwards start replacing with more desirable plants, or use as a permanent evergreen cover for an area with small bulbs.
This info based on experience with this plant in Central Netherlands (Zone 8) and Western Ireland (Zone 9).

I love this little Sedum; just wish it grew a little faster. I have it planted by Sedum spurium 'Purple Carpet', and it makes a really nice contrast in color, size, and shape.

It is settling in more slowly than the species (hasn't spread nearly as much.) I don't know if it would be a thug around some of the more particular/smaller rock garden plants as some of the sedums are. Overall very cute, chubby leaves, green with olive cast. Should be hardy in my zone; it is planted in a relatively exposed position in full sunon a South/West slope. Next spring will tell.