WARNING ZZ plants, along with many other houseplants, are toxic to cats. Mine are both trained not to eat the plants, so I chose to keep them, but if you have a cat that tries to eat the leaves, Yellowing leaves can be a plant's way of signaling that something's off! Here is a list of 5 common reasons you can use to troubleshoot your plant: Overwatering or Underwatering Miracle Gro Cactus, Palm & Citrus Potting Mix 2 Pack Yucca Glauca (Soapweed) Seeds for Sale Everwilde Farms Callisia repens 'Pink Lady' (Turtle Vine) World of Succulents Element by Altman Plants Succulent Plants 6 Pack Live Succulents Plants Full Sun 3.5 Inch Pots