ZZ Plant

The other genuinely unkillable houseplant: glossy dark leaflets on upright stems, fed by potato-like underground rhizomes that let it shrug off months without water. One rule - it is not food, and a chewed leaf burns immediately.

A small pot, gritty free-draining mix, and water only when it is dry right through. Any light will do; cold and wet will not.

Pot small. A container barely wider than the root ball, always with a drainage hole. ZZ rhizomes want to fill their pot, and an oversized one simply holds wet mix the plant cannot use — the commonest cause of failure. Terracotta helps by drying from the sides. When the rhizomes start deforming a plastic pot, which they are strong enough to do, go up one size.

Mix gritty. Cactus or succulent mix straight from the bag is ideal. Ordinary potting compost works if you cut it by a third with perlite, pumice or coarse sand. The aim is a mix that wets through and then dries out completely within a week or two.

Light: anywhere. It genuinely lives in a north-facing room or a windowless office under fluorescent light, and it grows faster, greener and more upright in bright indirect light. Direct sun scorches the leaflets, and deep gloom makes the stems stretch and splay outward instead of standing up. If your plant is falling open like a shuttlecock, it wants more light rather than more water.

Water: the whole discipline. Push a finger two inches into the mix. If you feel any moisture, wait. When it is dry through, water until it drains from the bottom and empty the saucer. Every two to four weeks in summer and every six to eight in winter is typical, but check rather than schedule — a plant in a cool dim room drinks a fraction of what the same plant drinks in a warm bright one.

Warmth and air. Keep it above 55°F. It ignores dry indoor air completely, needs no misting and no pebble tray, and asks only to be kept off freezing window glass in January. This is a plant with almost no requirements, and the temptation to do something for it is the main threat to its life.

Wipe the leaflets, feed twice a year, cut spent stems off flush at the soil, and repot only when the rhizomes are pushing the pot out of shape.

ZZ plant care is mostly restraint. Feed at half strength once in late spring and once in midsummer, and not at all from autumn to early spring — heavy feeding gives soft floppy stems that splay rather than more of them. Wipe the leaflets with a damp cloth every month or two, since that glossy finish is the whole point of the plant and dust dulls it fast. Leaf shine sprays are unnecessary; a damp cloth does better.

Repot every two to four years, or when rhizomes visibly bulge the sides of the pot. Go up one size only, in spring or summer, use fresh gritty mix, and water sparingly for the first fortnight while any broken rhizome surfaces seal over. A ZZ plant is perfectly happy crowded, so there is no hurry.

Pruning is simple and worth getting right. A stem that has yellowed is finished, and it will not green up again. Follow it right down to the soil and cut it off flush, wearing gloves — cutting halfway leaves a bare stalk that stays there for years. The plant replaces it from the rhizome in its own time. Trim individual damaged leaflets off at their base rather than trimming their tips, for the same reason.

Two small things people worry about unnecessarily. New stems emerge as pale, soft, almost yellow spears and darken over several weeks — that is healthy new growth, not chlorosis. And a ZZ plant occasionally throws a small greenish arum flower down at soil level, half hidden among the stalks; it is a curiosity rather than a sign of anything, and can be left or snipped off.

A chewed leaf comes first - call a vet or poison control rather than waiting. After that: yellow stems mean too much water, wrinkled leaflets mean too little, and splaying stems mean too little light.

A pet or a child has chewed a leaf. Call your veterinarian, an animal poison line, or poison control now rather than waiting to see how it develops. Rinse the mouth out with water and follow the advice you are given. Expect burning pain, drooling and perhaps some swelling and vomiting, settling within a few hours. Go to an emergency clinic or emergency room at once if drooling will not stop, if swallowing is difficult, or if there is any change in breathing or in the voice.

Stems yellowing from the base up, mix damp. Overwatering, and rot in the rhizomes. Tip the plant out, cut away every soft brown rhizome and root back to firm white tissue, let the cuts dry a day, and repot the sound pieces in fresh dry gritty mix. Do not water for a week.

Wrinkled, dull, slightly curling leaflets. The rarer problem — genuine drought. Water thoroughly and the plant firms up over a few days. A ZZ plant that has been dry for months may also drop whole stems; the rhizomes usually survive and push new ones.

Stems leaning outward, falling open in the middle. Too little light, or too much fertilizer, or both. Move it somewhere brighter but out of direct sun, stop feeding, and remove the worst-splayed stems at the base. New growth comes up straighter.

Brown crispy leaflet tips. Usually fertilizer salts built up in the pot, sometimes cold damage. Flush the pot through with plenty of plain water and ease off feeding.

Rhizomes pushing up out of the soil. Normal, and a sign the plant is doing well. Repot one size up in spring if it is lifting itself out of the pot.

My 'Raven' is coming up bright green. Correct. New Raven growth emerges lime green and darkens to near-black over several weeks. Nothing is wrong and it has not reverted.

Nothing is happening. If it is January, that is right. ZZ plants stop almost completely in winter and start again in spring, and a plant that puts up two or three new stems a year is a healthy one.

Division is fast, stem cuttings are slower, and a single leaflet will do it too - though a leaflet takes the better part of a year and makes a rhizome before it makes a leaf.

Division is the quick method and the only one that gives you a real plant immediately. Turn a crowded pot out in spring, find where the rhizome cluster separates naturally, and pull or cut it into pieces so that each piece has at least one rhizome and one stem. Pot each into a small pot of dry gritty mix and wait a week before the first watering.

Stem cuttings work well and take a few months. Cut a whole stalk at the base, cut it into three- or four-inch sections each carrying a couple of leaflets, let the cut ends dry for a day, and stand them upright an inch deep in barely damp gritty mix somewhere warm and bright. A small rhizome forms at the base first, then roots, then eventually a new shoot.

Leaflet cuttings are the classic party trick and they genuinely work — they are simply slow. Pull individual leaflets off with the little swollen base attached, let them callus for a day, and press them base-down into damp gritty mix. Over the following six to twelve months each one grows a pea-sized rhizome, and a shoot follows after that. Do not water them much and do not give up early; the plant is working underground where you cannot see it.

Whatever the method, work in spring or summer, keep everything warm, and resist watering. ZZ cuttings rot far more often than they dry out. Wear gloves throughout, and keep cut material off kitchen counters and away from pets.

An indoor plant across essentially the whole US - outdoors only in zone 10a and warmer, in dry shade. It is not an escape risk, but it is one of the least cold-tolerant plants on the shelf.

Zones 3-9 (nearly everywhere): grow it indoors year-round. ZZ plants handle dry heated air, low light and long gaps between waterings better than almost anything else, and they can summer outdoors in shade once nights stay reliably above 60°F — moved out gradually, never into direct sun, and brought back inside in early autumn rather than on the night of the first frost warning.

Zones 10-11 (south Florida, Hawaii, the frost-free Gulf, coastal southern California): it can be grown outdoors as a shade or dappled-light plant in sharply drained soil, and it is genuinely useful in dry shade under eaves where little else will hold up. Unlike pothos and monstera, this one is not a recognised escape risk — it is slow, clumping and spreads only as far as its own rhizomes reach, so ordinary care with prunings and old mix is enough.

Cold is the real limit. Leaflets are damaged below about 50°F and stems collapse outright in a frost, so a pot left on a porch through one autumn night is usually finished. Where it comes from — the dry forests and rocky ground of eastern Africa, which have a long rainless season every year — explains both halves of its character: it expects months of drought and has never met a freeze.

Humidity is irrelevant. This is one of the few houseplants that genuinely does not care about dry indoor air, so no misting, no pebble tray, no humidifier.

An East African drought plant that sat in botanical collections for 150 years, then became a global houseplant in a single decade once Dutch nurseries worked out how to mass-propagate it from leaflets.

Zamioculcas zamiifolia comes from eastern Africa — from Kenya and Zanzibar south through Tanzania and Malawi to eastern South Africa — where it grows in dry forest and on rocky ground that goes rainless for months at a stretch. That is the whole explanation for the plant on your shelf: the rhizomes, the waxy leaflets and the ability to sit out a season are a drought strategy, not an office one.

The name is a botanist's note about a resemblance: the leaves look like those of Zamia, a cycad, hence Zamioculcas and zamiifolia. It was described in the early nineteenth century and then, for the better part of 150 years, remained a curiosity in botanical collections rather than a plant anyone sold.

What changed was propagation. In the 1990s Dutch nurseries worked out how to raise the plant commercially at scale from leaflet cuttings, and a plant nobody had heard of became a global fixture within about a decade — helped enormously by the fact that it survives conditions in offices and rental apartments that kill everything else. The near-black cultivar 'Raven', introduced at the end of the 2010s, did the same thing again on a smaller scale.

Two footnotes. Parts of the plant have local traditional uses in East Africa, including as a poultice; that is a piece of ethnobotany rather than a suggestion, and given the oxalate content there is no home use of this plant worth attempting. And the persistent internet claim that ZZ plants are radioactive or carcinogenic has no basis whatever — it appears to be a garbled retelling of ordinary oxalate irritation, and it has been debunked repeatedly by university extension services.