How often should I water a ZZ plant?

The ZZ plant keeps a reserve of water in the potato-like rhizomes under the soil, so it is built to be left alone between waterings.

Every 14–21 days
A starting point, not a rule — check the soil before each watering and let the top few centimetres dry out first.

Always confirm with the soil: water when the top 2–5 cm is dry, whatever the calendar says.

Light

Zamioculcas zamiifolia is sold as a low-light plant, and it will survive a windowless office, but there it makes almost no growth and uses very little water. Bright, indirect light gives glossy new stems in spring and summer, and in that spot the calculator suggests every 11–17 days. Hot direct sun scorches the leaflets.

Pot and soil

The rhizomes swell as the plant grows and can split a thin plastic pot, which is a sign it is due for a larger one. Plant in a free-draining mix with plenty of grit or perlite, and choose a pot with drainage holes rather than a decorative cover that hides standing water. The plant is toxic to cats and dogs if chewed, so place it out of reach.

Through the year

Medium-light starting points are every 14–21 days in spring and summer, 18–27 days in autumn and 22–34 in winter, reaching 29–44 in low light in winter. A ZZ often pushes up new shoots in a single burst; it uses noticeably more water during one of these flushes, then settles back to a slower pace.

Too much or too little

Rot is the real risk. Yellowing that starts on the lower leaflets and spreads, stems that turn soft or brown at the base and topple, and rhizomes that feel squashy when you dig down all point to too much water. A thirsty ZZ is harder to spot: the leaflets lose their shine, wrinkle slightly and may drop, and the rhizomes shrivel. It recovers well after a thorough soak.

The plant watering calculator explains how the intervals are worked out for every plant on the list.

Frequently asked questions

Why is my ZZ plant turning yellow?

Yellowing, especially on several stems at once, is most often overwatering. Unpot the plant and check the rhizomes: firm and pale is healthy, soft and brown is rot, which should be cut away before repotting into dry mix. Old stems yellowing one at a time while new ones grow is normal turnover. Stretch the interval and let the pot dry completely between waterings.

Can a ZZ plant go a month without water?

Usually, yes, particularly in autumn and winter. The calculator’s winter figure in low light is 29–44 days, and a mature plant with plump rhizomes can manage that without harm. Smaller plants and those in bright, warm rooms dry faster, so check the soil rather than relying on the date. It is a good plant to leave while you are away.

Leaflet works out this schedule for every plant you own and reminds you.

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