Euphorbia tirucalli

A pencil-branched succulent that transforms from green to blazing orange-red in winter, but beware its highly toxic sap.
Frost sensitive, hardy to about 30°F, USDA 9-11; a tender low-desert succulent that colors best in cool, dry winters.
AMWUA Notes
Highly toxic milky sap — handle with care. Frost sensitive.
Water monthly in the warm season and sparingly in winter; very drought tolerant and rot-prone if overwatered.
Prune to control the 10 ft size, always wearing gloves, long sleeves and eye protection—the copious white sap is highly toxic and caustic.
Not necessary; lean, dry conditions intensify the orange-red winter color.
Trouble-free; the toxic sap deters pests.
Frost-tender below 30°F—protect in freezes; stems flush brilliant orange-red with winter cold and drought stress.
Fast-draining gritty mineral soil or decomposed granite; low organic matter
Needs sharp, fast-draining soil.
Low feeder.
Stem cuttings (callus first; wear protection against the toxic sap)
6 ft
Shallow, non-invasive roots; site away from traffic due to the caustic, highly toxic sap
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Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.