Snake Plant

The hardest houseplant in the world to kill, as long as you stop watering it - stiff upright leaves, real tolerance of dim rooms, and a mild toxicity that is nothing like a true lily's.

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

Pot small. Choose a container barely wider than the root ball, always with a drainage hole. A snake plant likes to be crowded, and an oversized pot holds a reservoir of wet soil the plant cannot use — the single most common cause of failure. Terracotta helps by drying from the sides.

Mix gritty. Cactus and 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. What you are aiming for is a mix that wets through and then dries out completely within a week or two.

Light: anywhere. It genuinely survives a north-facing room or a windowless office under fluorescent light, and it grows faster, stiffer and more strongly marked in bright indirect light. It will take some direct sun if you move it there in stages over two or three weeks; sudden full sun bleaches the leaves.

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

Warmth. Keep it above 50°F. Snake plants are tropical and are damaged by cold long before frost; the winter danger is a pot pressed against icy glass or standing by a door that keeps opening.

Water rarely, feed twice a year, wipe the dust off, repot every few years - and cut damaged leaves off at the base rather than trimming their tips.

Most snake plant care is 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 leaves rather than more of them. Wipe the leaves with a damp cloth every month or two — those broad flat surfaces collect dust that noticeably dulls the plant and slows it down.

Repot every two to four years, or when the rhizomes start deforming a plastic pot (they are strong enough to split one). Go up one pot size only, in spring, and water sparingly for the first fortnight while any broken roots seal over.

One rule people get wrong: a cut leaf never regrows its tip. Trimming a browned point leaves a blunt-ended leaf that stays blunt for the rest of its life. If a leaf is damaged, marked or bent, cut the entire leaf off at soil level with a clean blade and let a new spear replace it — the plant is always making new ones.

If a mature plant flowers, expect a slim spike of greenish-white night-scented flowers that drips clear sticky nectar on the leaves and the floor. It is nectar, not a pest and not a leak. Wipe it up, cut the spike when it browns, and remove any orange berries that follow, since they carry the same saponins as the leaves and sit at exactly toddler height.

Falling leaves mean rot from overwatering; wrinkled leaves mean the opposite. Plus what to do if a pet chews one, and why a snake plant leaf is no use on a burn.

Leaves flopping outward and soft at the base. Rot, from too much water or a pot with no drainage. Tip the plant out. Cut away every soft brown rhizome and root until you reach firm white tissue, let the cuts dry for a day, and repot the healthy pieces in fresh dry gritty mix. Do not water for a week. If the whole base is mush, take clean upper leaf sections as cuttings and start again.

Wrinkled, curling, folding leaves. The rarer problem — genuine drought. Water thoroughly and it firms up within a few days.

Brown crispy tips. Usually cold damage, physical damage in transit, or long-term dryness. Do not trim the tip; the leaf will not repoint. Live with it or remove the leaf at the base.

New leaves on my variegated plant came up plain green. You propagated it from a leaf cutting. The yellow margin on 'Laurentii' and similar cultivars is a chimera that only survives division, not leaf cuttings. Split the clump instead.

White cottony tufts in the leaf axils. Mealybugs. Dab each one with a cotton bud dipped in rubbing alcohol, then treat with insecticidal soap weekly until they stop appearing.

My cat or dog chewed a leaf. Call your veterinarian or an animal poison line and describe what happened; do not wait to see whether it gets worse. Expect drooling, vomiting or loose stools rather than an emergency — snake plant saponins are irritating, not lethal. Rinse the animal's mouth if it will let you, and keep water available. If a child has eaten leaf or berry, call poison control straight away and take the plant name with you: same advice, same reassurance, but let them make that call rather than you.

Can I use it on a burn like aloe? No, and this is worth checking before you cut. Slice an aloe leaf and clear slippery gel wells out of it; slice a snake plant leaf and you get dry, stringy fibre and no gel at all. Aloe leaves are plump and triangular in cross-section with soft teeth along the edge; snake plant leaves are flat, stiff, smooth-edged and banded crosswise. If there is no gel, put it down.

Divide the clump to keep variegation, or root leaf cuttings if you do not mind losing it - both are nearly foolproof, just slow.

Division is the method that keeps the plant true. Turn the pot out in spring, find where the underground rhizomes join, and cut a clump of two or three leaves with its own roots away with a clean knife. Pot each piece in dry gritty mix and wait a week before the first watering. This is the only method that preserves a yellow-margined cultivar.

Leaf cuttings are the classic windowsill trick and work reliably, with one catch. Cut a healthy leaf into three-inch sections, marking which end pointed down — a section planted upside down will never root. Let the cuts dry and callus for a day or two, then stand them base-down an inch deep in dry gritty mix, or in an inch of water changed weekly. Roots take a month or so, a new pup several months more.

The catch: variegation does not survive a leaf cutting. The yellow edge of 'Laurentii' and the pale stripes of 'Golden Hahnii' are a chimera carried in one cell layer, and the pups that grow from a leaf section come up plain green. If you want the yellow edge, divide.

Whichever method, work in spring or summer, keep the new pieces warm, and resist watering. Snake plant cuttings rot far more often than they dry out.

A West African fibre plant that became the Victorian parlour survivor, was renamed out of Sansevieria in 2017, and got famous on the back of a NASA study that is routinely oversold.

The plant comes from tropical West Africa, and its oldest use has nothing to do with decoration: the leaves yield a strong, fine fibre that was twisted into cordage and bowstrings, which is where the name bowstring hemp comes from. The genus honoured an 18th-century Neapolitan patron, Raimondo di Sangro, Prince of San Severo — hence Sansevieria.

It reached European conservatories in the 18th century and turned out to be perfectly suited to the Victorian parlour: gas lighting, coal smoke, draughts and erratic care killed most things, and the snake plant simply carried on. That reputation followed it into 20th-century offices and lobbies worldwide.

In 2017 genetic work folded Sansevieria into Dracaena, so the correct name is now Dracaena trifasciata. Nurseries and labels still say Sansevieria, and both names refer to the same plant.

One thing deserves an honest correction. The 1989 NASA Clean Air Study did test snake plant among others and did find it removed formaldehyde and benzene from the air — inside a sealed laboratory chamber the size of a fish tank. Later work scaling those results to real rooms found you would need something on the order of a hundred plants per small room to match the air exchange an open window already provides. Grow it because it is handsome and unkillable; the air-purifying claim on the plant tag is doing more work than the science supports.

Tender: an indoor plant across almost all of the US, an outdoor one only in zones 10-11 - where it escapes and needs containing.

Zones 3-9 (nearly everywhere): grow it indoors year-round. It handles dry heated air, low light and neglect better than almost any other houseplant, and can summer outdoors in shade once nights stay above 55°F — move it out gradually and bring it back in early autumn, well before the first frost.

Zones 10-11 (South Florida, Hawaii, the frost-free Gulf and coastal Southern California): it grows outdoors as a shade or dappled-light groundcover in sharply drained soil, and this is where it needs watching. Snake plant spreads by underground rhizome, tolerates drought and shade, and has naturalized in Florida, Hawaii and the Caribbean, forming dense colonies in hammock understorey that crowd out native plants. In those states keep it in containers or a bed you can edge, never at the margin of natural land, and bag rhizome pieces rather than composting them.

Cold: leaves are damaged below about 50°F and destroyed by frost, so a plant left on a porch through one cold night is usually finished. Humidity is irrelevant — this is one of the few houseplants that does not care about dry indoor air.