I think they're pretty hard to kill, for the most part! Maybe don't overwater it? They'd probably do better if you forget to water than if you give too much.

[Desert plant, and all that. Drought tolerant but much less tolerant of damp, rot-prone conditions.]

Ah, but that's also why we have lovely Miss Vaska to help us, isn't it? She's an expert!

[Probably. You'd have to at least have some knowledge if they're your main product, right? Surely she's sold plants to black thumbs in the past and managed to match them up with something that they can't kill. At the very least, she'd know which plants can survive a month-long course of neglect.]