Amazon.com: Good Pet Stuff, The Original Hidden Litter Box, Artificial Plants & Enclosed Cat Planter Litter Box, Vented & Odor Filter, Easy to Clean, Mocha Brown , 20" wide x 19 3/4" :
Good Pet Stuff Hidden Planter Litter Box Review - Cats.com
Houseplants: Use cat litter to help your plants 'thrive' - 'prevents plant drying out' | Express.co.uk
Stop littering with your cat's litter – Rufus & Coco USA