Lithops

 
LIGHT
Lithops need a lot of sunlight to thrive. They need 6 hours or more of direct sunlight every day. Place the living stones in a south-facing window and they will be happy.
 
WATER
Let 100% of the soil volume dry before watering during the spring and summer. These plants thrive in a dry environment. In the fall and winter, these plants typically go dormant and need little to no water. Water only if the lithops have begun to shrivel up.
 
HUMIDITY
Lithops are typically happy in average household humidity. No need to mist or boost the humidity.
 
TEMPERATURE
Lithops do well in average household temperatures and can tolerate temperatures from 50-80°F.
 
FOOD
Lithops do not need much fertilization as they are native to lean soils that contain very few nutrients. Fertilize once per year in the spring with a very weak solution of general purpose houseplant fertilizer, diluted to 25% strength.
 
TOXICITY
Living stones are non-toxic and safe to have around children and pets.
 
ADDITIONAL CARE
Lithops are very susceptible to rot if watered improperly. Always err on the side of underwatering, and water the soil surface only or use the bottom-watering method since watering the plant itself can cause rot.