Crassula arborescens subsp. undulatifolia Toelken
Crassula arborescens subsp. undulatifolia is a succulent shrub with very stout fleshy branches and opposite pairs of elliptic, twisted, bluish-grey leaves with dark green dots and purple edges. It grows up to 3 feet (90 cm) tall. The compact, rounded heads of white to pink, star-shaped flowers appear from spring to mid-summer.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
Crassulas are easy to grow, but they are susceptible to mealy bugs and fungal diseases. As with all succulents, overwatering is sure to be fatal, so err on the side of too dry rather than too wet. Never let your plant sit in water. If you water from beneath by letting the plant sit in a saucer of water, make sure to pour off any excess water after a few minutes.
These succulents are generally started by division, offsets, or leaf cuttings. Crassulas can be easily propagated from a single leaf. Sprout leaves by placing them into a potting mix for succulents, then covering the dish until they sprout.
Repot as needed, preferably during the warm season. To repot your Crassula, make sure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, making sure to remove any rotted or dead roots in the process. Treat any cuts with a fungicide. Place the plant in its new pot and backfill with potting soil, spreading the roots out as you repot. Leave the plant dry for a week or so, then begin to water lightly to reduce the risk of root rot. See more at How to Grow and Care for Crassula.
Crassula arborescens subsp. undulatifolia is native to South Africa (southern parts of the Klein Winterhoek Mountains of the Eastern Cape).
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