Many philodendrons and Chinese Evergreen Plants are very tough and adaptable to some degree of negligence. I think Airplane plants have already be noted, they're very adaptable. With some light situation Streptocarpas will provide flowering interludes. Most mentioned here are primarily house plants. Cacti may be especially apropos as you already reside in the cactus state. Another bulb that could provide above ground action/interest and is tough as nails is the Pregnant Onion (I think it's maybe in the Ornithogalum genus (they grow perceptually and reproduce baby bulbs from their sides at a fair speed, these can be left there or used to start new plants.
Were these plants of the characteristic required by your beneficiaries?
If you want any of the pregnant onion bulblets, piece of cake to oblige.
