Agave lophantha
The thorn-crested agave of southern Texas and northeastern Mexico, now usually called Agave univittata. It is a tough, clumping, full-sun agave that tolerates brief light frost if kept dry, and it grows in summer with a cooler, drier winter.
Where it grows wild
Rocky limestone slopes, scrub and open woodland in northeastern Mexico and the lower Rio Grande region of Texas.
Recorded at 256β2505 m, median 950 m (54 records); Wikipedia describes the species as coastal below 100 m.
π Growing it like that
The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its Public domain licence, unmodified.