Water a ZZ plant only when its soil is completely dry. In most homes that’s about every 2 weeks in spring and summer, and once a month or less in winter.
Its thick rhizomes hold a lot of water, so it can go weeks without a drink. Overwatering, not underwatering, is what kills most ZZ plants.
How to Tell When It Needs Water
- Finger test: push a finger 2 inches in. Water only if it is dry all the way down.
- Weight test: a dry pot feels noticeably light.
- Stems: slightly wrinkled or soft stems mean it is using stored water. Time to water.
A moisture meter is the most reliable check, especially in big pots.
Watering by Season
| Season | How often | Why |
|---|---|---|
| Spring | Every 2 to 3 weeks | New shoots are forming |
| Summer | About every 2 weeks | Warmth and light dry the pot faster |
| Fall | Every 3 to 4 weeks | Growth slows |
| Winter | About once a month, or less | Little growth; wet, cool soil causes rot |
Pot size, light and your home’s temperature all shift these numbers, so always check the soil first.
How Much Water to Give
Water thoroughly until it runs out of the drainage hole, then let the pot drain completely. A deep, occasional soak is better than frequent sips.
Always empty the saucer after 15 minutes. A pot sitting in water is the fastest way to rot the rhizomes.
Signs of Overwatering
- Yellow leaves, often starting at the bottom
- Soft, mushy or dark stems near the soil
- Leaves dropping off easily
- A sour smell from the soil
If you see these, stop watering, tip the plant out and check the rhizomes. Firm and pale is healthy; brown and mushy is rot. See how to save a dying ZZ plant.
Is Tap Water OK?
Yes. ZZ plants aren’t fussy about water. If your tap water is very hard and leaves a white crust on the soil, flush the pot with plenty of water every few months or use filtered water.
Signs of Underwatering
Wrinkled, shriveled stems and curling leaves mean the plant has used up its stored water. A good soak usually plumps it back up within a week.
A Pot That Helps
Terracotta pulls extra moisture out of the soil, giving you a safety margin against overwatering.
A set of terracotta pots with saucers works well for ZZ plants. For the rest of the basics, see my ZZ plant care guide.
Watering Questions
How long can a ZZ plant go without water?
A healthy ZZ can go 3 to 4 weeks, and longer in winter, thanks to its water-storing rhizomes.
Should I water my ZZ plant from the bottom?
You can. Set it in water for 15 to 20 minutes, then let it drain. Either method works if the soil dries out between waterings.
Why are my ZZ stems wrinkled?
Usually thirst. Water deeply and the stems should firm up within days.
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