Caryn worked five twelve-hour shifts in six days last week. On day four she came home at 7:40am, ate cereal standing over the sink, looked at the pothos on top of the refrigerator, thought “I should water that,” and went to bed for nine hours. The pothos has received that exact treatment since 2020 and has grown roughly eleven feet of vine in the meantime.
That is the test. Not a greenhouse, not a grow light, not a person with a watering schedule in a notes app. Two nurses, a garage full of printers that need more attention than anything green in the house, and stretches where nobody thinks about a plant for three weeks at a time. Everything below has survived that, in our own homes, and we can tell you exactly how each one fails when it finally does.
One warning before the list. “Unkillable” and “safe around your cat” are completely unrelated qualities, and the toughest plants in this article are some of the more problematic ones to have at ankle height. We cite the ASPCA on every single one, because a brand fronted by two nurses getting that wrong would be unforgivable.
Jump to a plant
- What we actually mean by unkillable
- Snake plant
- ZZ plant
- Pothos
- Spider plant
- Cast iron plant
- Peperomia
- Hoya
- Air plants
- How people kill these anyway
- What we would put on a first shelf
What we actually mean by unkillable
No plant is unkillable. You can kill any of these in about six weeks by putting it in a pot with no drainage and watering it on a Tuesday schedule. What these eight have in common is a much more specific and more useful property: they tolerate being forgotten far better than they tolerate being fussed over.
Most of them store water, in thick leaves or in underground structures. Most of them evolved somewhere with a dry season, which means a stretch of drought reads to them as normal weather rather than an emergency. And all of them will sit in low light for months without dying, though several will stop growing and sulk about it.
Our bias, stated up front: we would rather hand a beginner one plant that survives three weeks of nothing than five that need a routine. Confidence is the scarce resource. Not plants.
Snake plant
Sansevieria trifasciata, also sold as Dracaena trifasciata and mother-in-law’s tongue. The toughest plant in this article and the one we hand to people who have already killed something.
Jill’s has been in the same corner of a north-facing hallway since 2018, roughly nine feet from the nearest window, watered when somebody notices it, which averages out to about once a month in summer and once every six or seven weeks in winter. It has gained four leaves in that time. Nothing dramatic. Nothing dead either.
Snake plants store water in their leaves and run a modified photosynthesis that lets them take in carbon dioxide overnight, which is part of why drought barely registers. The only common way to kill one is standing water at the root. Plant it in something with a drainage hole and let the soil go completely dry between waterings, not partly dry.
Snake plant is listed as toxic to cats and dogs by the ASPCA, which lists saponins as the culprit and nausea, vomiting and diarrhea as the signs. It is a chewer’s plant in the worst way, since those stiff leaves are satisfying to a bored cat. Put it up high or skip it.
ZZ plant
Zamioculcas zamiifolia. Glossy, upright, and equipped with potato-like rhizomes underground that store water the way a camel stores lunch.
We have a ZZ in the windowless half of the garage that gets natural light only when the side door is open and otherwise lives under a shop bulb. It has been there two years and has put out new stems twice. It gets watered when the printers do not need us, which is not often.
Yellowing lower leaves on a ZZ almost always mean too much water, not too little. If you are not sure, wait another two weeks. That advice is wrong for most houseplants and right for this one.
On pets, be careful what you read. ZZ plant does not appear in the ASPCA’s toxic and non-toxic plant list at all, so nobody can honestly cite them either way on it. Veterinary sources generally treat it as toxic on the basis of the calcium oxalate crystals in its tissue, and that is how we treat it too. Absence from a list is not a clearance.
Pothos
Epipremnum aureum. The refrigerator plant from the opening paragraph, and the one most likely to be in your dentist’s waiting room.
Pothos is on this list for one specific reason: it tells you. A thirsty pothos goes soft and droops visibly, you water it, and within four hours it has stood back up as though nothing happened. No other plant here gives you feedback that fast or forgives that completely. It is the ideal training plant for someone learning to water by looking rather than by calendar.
It will grow in genuinely dim corners. It will also get leggy there, with long bare stretches of vine and leaves the size of a quarter. If yours looks like a piece of string with three leaves on the end, that is a light problem, and moving it six feet closer to a window fixes it over a season.
Pothos is listed as toxic to cats and dogs by the ASPCA, which names insoluble calcium oxalates and describes intense burning of the mouth and lips, drooling and trouble swallowing. We are flagging this loudly because the internet is full of blog posts claiming the opposite, several of them confidently attributing the claim to the ASPCA. Click the link and read it yourself. It takes nine seconds.
Spider plant
Chlorophytum comosum. Thick white tuberous roots, arching leaves, and a reproductive strategy that borders on aggressive.
A stressed spider plant does not die. It throws out runners with baby plants on the ends, which is its way of leaving the building. Snip one off, set it in water or straight into damp soil, and you have another plant in a few weeks. Caryn has given away enough spider plant pups to stock a break room.
Brown crispy tips are the standard complaint, and the usual causes are fluoride and salts in tap water building up, or very dry winter air. Neither one kills it. Flush the pot thoroughly a couple of times a year and trim the tips if they bother you.
Spider plant is listed as non-toxic to cats and dogs by the ASPCA. Cats do tend to chew the dangling leaves, so expect some editing.
Cast iron plant
Aspidistra elatior, and the name is not marketing. Victorian households kept these alive in gaslit parlors, which is a lighting situation worse than anything in your apartment.
Deep green strappy leaves, extremely slow growth, and a tolerance for neglect that is almost comic. It handles low light, drafts, cold rooms, and irregular watering. The trade-off is that it grows so slowly you will wonder if it is doing anything, and a new leaf is genuinely an event worth texting somebody about.
Cast iron plant is listed as non-toxic to cats, dogs and horses by the ASPCA. It is our first recommendation for a dark room in a house with a cat, which is a combination almost nothing else on this list handles.
Peperomia
A big genus, and the one we sell the most small pots for, because peperomia stay compact enough to live in a three-inch pot for years without complaint.
The thick-leaved types store water like a succulent while still being happy in ordinary indirect light, which is an unusual and very useful combination. Watermelon peperomia is the pretty one. Peperomia obtusifolia, the baby rubber plant, is the durable one, and it is the one we would actually put on a desk under office lighting.
Kill method: overwatering, every time. Those thick leaves mean it is already carrying reserves, and a peperomia in constantly damp soil drops leaves from the bottom and then collapses at the stem fairly suddenly.
Baby rubber plant is listed as non-toxic to cats and dogs by the ASPCA.
Hoya
Hoya carnosa and relatives. Waxy, semi-succulent leaves on trailing vines, and a plant that is genuinely happier slightly pot-bound and slightly ignored.
Hoyas are an argument for doing less. Repot too often and you delay flowering by a year. Water on a schedule and you rot the roots. Leave one alone in bright indirect light in a small pot with a drainage hole, water it when the top two inches are dry, and eventually you get clusters of flowers that look like they were assembled by hand and smell like they were bought at a counter.
Ours lives on a bracket above the printer bench where the ambient temperature runs warm year round, which it seems to enjoy.
Hoya, listed by the ASPCA as wax plant, is non-toxic to cats and dogs.
Air plants
Tillandsia belong on this list with an asterisk. There is no soil to overwater, no pot to get wrong, and no roots to rot, which removes the three most common beginner mistakes in one move.
The asterisk is that they trade those mistakes for one new one, which is leaving water sitting in the plant’s crown after watering. Get the drying right and an air plant will forgive a shocking amount of neglect. We wrote out the whole routine in our air plant care guide, and the specific question of soaking versus misting gets settled in how to water an air plant.
Start with a Tillandsia ionantha. They cost a few dollars and they are remarkably hard to offend.
How people kill these anyway
Every plant above can be finished off, and the causes are boringly consistent.
- A pot with no drainage hole. The single most common cause of death in this entire category. A decorative pot with a sealed bottom turns every watering into a small flood with nowhere to go. There is a hole in the bottom of every pot we make, and we are not being modest when we say that is the least interesting and most important thing about them.
- Watering by calendar. Sunday watering is a habit, not a diagnosis. Put a finger two inches into the soil first. If it is damp, walk away.
- Too much pot. A small plant in a large pot sits in wet soil for weeks because there are not enough roots to drink it. Size up gradually.
- Confusing low light with no light. Tolerating dim is not the same as growing in the dark. A plant six feet from a window is in low light. A plant in a windowless bathroom is in a closet.
- Attention after a scare. A drooping plant gets watered, perks up, and then gets watered again three days later out of enthusiasm. That second watering is the one that does the damage.
What we would put on a first shelf
If you live with a cat who chews: cast iron plant, spider plant, peperomia. That is a shelf that survives both the animal and you.
If there are no pets in the picture: a snake plant in the dim corner, a pothos somewhere it can trail, and an air plant to prove to yourself that a plant with no soil at all can outlive a rough month.
Whatever you pick, the pot matters more than the plant, which is a strange thing for us to say out loud given that we make the pots. Drainage and a size that actually fits the root ball will save a plant that the wrong window would otherwise have taken. Ours are printed to order in the garage from plant-based PLA, one at a time, usually overnight, and they all have a hole in the bottom. Here they are, if the next one on your shelf needs somewhere to live.