This cactus plant in my neighbor's yard stands 4 to 5 meters tall. To shoot this I was on top of the block wall that separates our yards and it still towered way over my head.
Actually, Anne Worner set me straight. ". . . a succulent and not a cactus though, possibly in the euphorbia species."
Anne is correct. Leave it to a Texan to know her cactus plants.