Hi Erin,

Yellow leaves are an indication that the plant has been over-watered and is the only way to kill a ZZ plant. They do not like wet feet so allow the soil to thoroughly dry out before watering. ZZ plants have thick roots called rhizomes that store water so when in doubt, do not water. Unlike most plants, Zamioculcas are very forgiving plants, allowing you to over-water a few times before showing signs of serious damage.

You can read all my care tips in the Popular Houseplant section of the website.

https://www.houseplant411.com/houseplant/zz-plant-zamioculcas-zamiifolia-how-to-grow-care-for-a-zz-plant

ZZ plants, Zamioculcas zamiifolia, are very poisonous plants and should be kept away from pets and children. Read more about common houseplants that are poisonous in Don’t Feed Me To Your Cat! A Guide to Poisonous Houseplants