How Often to Water a ZZ Plant (and Why Less Is More)

The short answer

NC State Extension says to water a ZZ plant (Zamioculcas zamiifolia) about twice a month in summer, but only if the soil has dried out completely, and only once a month in winter, when it isn't actively growing. Treat it much like a cactus or other succulent.

Why ZZ plants die from too much water

A ZZ grows from thick, fleshy underground rhizomes, and its glossy leaves store water. That makes it highly drought tolerant, but it does not tolerate "wet feet." Pot it in well-drained potting soil and let it dry out between waterings.

How to tell it's dry

Check the soil, not the calendar: NC State Extension's rule is to water only when the soil has dried out completely. When you do water, water so it drains through the soil and out the holes (UW–Madison Extension), and don't leave the pot standing in water.

Summer vs winter

In summer, while the plant is growing, about twice a month is typical once the soil is fully dry. In winter, when growth stops, cut back to about once a month. Feed only once or twice a year with a balanced liquid houseplant fertilizer.

Low light vs bright light

ZZ plants will grow in very low light, even under fluorescent office lights, but they do best in bright, indirect light. Avoid direct sun, which can scald and brown the leaves.

Pot and drainage

Use a pot with a drainage hole. Iowa State Extension notes that without one the soil stays wet and roots rot, and a layer of gravel in the bottom does not make up for a missing hole. Want a decorative pot? See pots without drainage holes.