Crassula commutata a.k.a "Tom Thumb"
Tölken's 'Tom Thumb' (Crassula rupestris ssp. commutata): A stacked Crassula in miniature. This small succulent is native to Namibia and South Africa, where it thrives on hot, dry rocky hillsides. Its thick, triangular leaves are only 0.4" long, but they store enough water to let the plant survive lengthy periods of drought.
The leaves of 'Tom Thumb' grow best in full sunlight, which helps them show off their delicate crimson borders. It flourishes in well-draining pots with grittier soil, only needing a deep watering when the soil is completely dry on occasion.