ZZ plant care

A ZZ plant needs water only when its soil is completely dry (about every 2–3 weeks in summer and every 4–6 weeks in winter), any light from a dim office to a bright room without hot direct sun, and temperatures above 60°F. It is close to indestructible as long as you underwater rather than overwater.

Below are the numbers, how to read yellow stems, soil and repotting, propagation from leaflets and rhizomes, the cultivars you'll see in US stores, and what to know about toxicity.

What a ZZ plant is

Zamioculcas zamiifolia is an aroid from eastern Africa, the only species in its genus. What look like branches are actually single compound leaves: each upright "stem" is a petiole with 6–8 pairs of glossy leaflets. Under the soil sit thick, potato-like rhizomes that store water, which is why the plant survives droughts and office neglect.

Clemson HGIC describes plants reaching 2–4 ft tall, slow growing, and a great choice for new houseplant owners. Growth comes in flushes — several new stems at once, then nothing for months — which is normal.

Light

ZZ plants tolerate low light better than almost any other houseplant, but they don't need it. Iowa State Extension says the plant performs best in bright, indirect light, tolerates very low light, and that direct afternoon sun can damage the leaves.

In low light ZZ stems stretch and lean toward the window. Turn the pot a quarter turn every few weeks. More on placing plants in light for houseplants and see low-light plants for companions.

Watering

Water when the soil is dry all the way through. Clemson HGIC recommends watering 1–2 times a month, only after the potting medium has completely dried, and warns that overwatering and root rot are the main concern.

Practical intervals for a 6–8-inch pot:

• Spring–summer, bright room: every 2–3 weeks.
• Fall: every 3–4 weeks.
• Winter with heating: every 4–6 weeks.
• Low-light office: every 4–8 weeks year-round.

How to check: push a wooden skewer to the bottom of the pot; it should come out dry. Or lift the pot — a dry ZZ pot feels noticeably light. Water thoroughly until it drains, then make sure no water stays in the saucer or decorative outer pot.

When in doubt, wait a week. A thirsty ZZ shows it slowly (leaflets wrinkle or drop, stems stay alive); a waterlogged ZZ rots from below and you often notice only when stems collapse. Full guidance is in how often to water a ZZ plant and in the general overwatering guide.

Yellow leaves: what they mean

Yellowing is the most-searched ZZ problem. Read it like this:

1. One old lower leaflet yellowing now and then — normal aging.
2. Whole stems yellowing, starting from the bottom, soil still damp — overwatering. Stop, unpot, inspect rhizomes.
3. Yellow-brown crispy patches on the sunny side — sunburn.
4. Leaflets yellowing and dropping, soil dry for weeks — drought. ZZ deliberately sheds leaflets to save water; the stems and rhizomes regrow.

If rhizomes are soft, brown and smell, cut away all rot back to firm tissue, let cuts dry for a day, and replant in dry gritty mix. Firm leaflets from the damaged stems can be propagated as insurance. See yellow leaves and root rot for the general process.

Soil and pots

Use a coarse, fast-draining mix. Clemson's suggestion is 50% peat- or coir-based potting soil, 25% perlite and 25% sand; a mix of cactus soil and orchid bark works just as well. Always use a pot with a drainage hole.

Plastic or glazed pots are fine because ZZ is not fussy, but the rhizomes are strong enough to warp or crack thin plastic when root-bound. Heavier terracotta or ceramic keeps tall plants from tipping. Details in the soil guide.

Repotting

ZZ plants grow slowly and like a snug pot, so repot only every 2–3 years in spring, or when:

• The pot is bulging, cracked, or rhizomes are visible at the surface.
• Water runs straight through and the soil dries in a few days.
• The plant is so top-heavy it tips over.

Move up only 1–2 inches in diameter. Keep the rhizomes at the same depth, don't bury them deeper. Water lightly a week after repotting, since broken roots need time to heal. Large clumps can be divided by pulling apart rhizome groups, each with a few stems. Step-by-step in repotting a ZZ plant.

Temperature and humidity

ZZ plants like ordinary indoor temperatures, 65–85°F. Clemson notes they are sensitive to cold and should be kept above 60°F. Cold plus wet soil is a fast route to rot, so in winter keep pots off cold window glass and away from entry doors, and water less.

Humidity is a non-issue: normal household air, even dry winter air with forced-air heating, is fine. Don't mist.

Outdoors: ZZ can be grown outdoors year-round only in frost-free climates, in filtered light without direct sun. Elsewhere it can summer on a shady porch once nights stay above 60°F.

Fertilizer

ZZ plants are light feeders. Clemson recommends balanced fertilizer only once or twice during the growing season. A balanced liquid houseplant fertilizer at half strength in April and again in June or July is enough. No feeding in fall or winter. See the fertilizer guide.

Propagation

ZZ propagates by division, stem cuttings and even single leaflets — all slow but reliable:

• Division in spring: separate rhizome clumps with stems attached. Instant new plant.
• Stem cuttings: cut a whole stem at the base, let it dry a day, root in water or moist mix. Roots in 4–8 weeks, a small rhizome follows, new shoots can take 6–12 months.
• Leaflets: pull single leaflets, insert the base about a third deep in moist, gritty mix. Each forms a tiny rhizome over 2–4 months before any shoot appears.

Warmth (75–85°F) and bright indirect light speed everything up. Details and timelines are in ZZ plant propagation.

Varieties sold in the US

Flowers

Mature, well-lit ZZ plants occasionally produce a small, creamy aroid spathe close to the soil, often hidden among the stems. It's interesting but not showy. Indoors it is rare, and it doesn't change care. More in ZZ plant flower.

Toxicity

ZZ plant is an aroid and, like its relatives, contains calcium oxalate crystals that irritate the mouth, throat and stomach if chewed. Clemson HGIC says it is not pet-safe and should be kept away from animals and children, and Iowa State Extension calls it toxic if ingested by humans or pets. ZZ plant doesn't have its own entry in ASPCA's toxic plant list, so don't take its absence as a sign it's safe. If a pet chews it, call your vet, ASPCA Animal Poison Control at (888) 426-4435, or Pet Poison Helpline; for a child, Poison Control at 1-800-222-1222. Washing your hands after handling cut stems is sensible. See also toxic plants.

Common mistakes with ZZ plants

• Watering weekly "like the other plants." Weekly watering is the most common way to kill a ZZ. It stores weeks of water in its rhizomes.
• A decorative pot with no drainage. Water collects at the bottom where you can't see it, and the rhizomes rot. Use a nursery pot inside the cachepot and tip out any standing water.
• Repotting into a much bigger pot. More soil means more water held around the rhizomes for longer. Go up one size.
• Burying the rhizomes deeper. Keep the tops of the rhizomes just under the surface, as they were in the nursery pot.
• Leaf shine sprays. The leaves are naturally glossy; shine products clog the surface and attract dust. A damp cloth is enough.
• Moving a dark-office plant straight into full sun. Leaves that grew in low light burn quickly. Move it gradually over two weeks.

ZZ plant through the year

ZZ plant vs look-alikes

ZZ is sometimes confused with a few other glossy plants. Zamia furfuracea (cardboard palm), whose leaves inspired the ZZ's species name, is a cycad with stiff, fuzzy, rounded leaflets and a woody trunk; it is highly toxic to pets. Chinese evergreen (Aglaonema) has broad, single leaves on short stems rather than compound leaves. The tell for ZZ is the thick, swollen base of each stem and the evenly paired, waxy leaflets along it.

ZZ plant at a glance

• Water only when the pot is completely dry; less in winter and low light.
• Any light except hot direct sun.
• Above 60°F, no misting.
• Gritty mix, drainage hole, snug pot; repot every 2–3 years.
• Feed once or twice in summer.
• Keep away from pets and children.

If you like ZZ's toughness, compare it with the snake plant, which follows nearly the same rules, and browse office plants and easy houseplants.