We Get Questions
First there was a phone call, and then there was a photo.
This is the one I called to see if you could identify.
Thanks,
Bob
Bob,
It is not a Euphorbia, but a mutant cacti, Austrocylindropuntia subulata monstrose. The true species it tree sized and has four inch spines.
So treat like a standard fairly hardy cacti, rather than a fussy Euphorbia.
Hap