Houseplant · Asparagaceae
Corn Plant
Dracaena fragrans
Happy in a shady corner and slow to outgrow its spot, the corn plant really just wants clean water and a bit of warmth.
Bright indirect
50–81°F · 10–27°C
USDA 10–12
3–14 ft · 0.9–4.4 m
Overview
Looking for a plant that's tough to kill? The corn plant is about as easygoing as houseplants get. It grows up a thick, woody cane with long, arching leaves on top, and that wide yellow stripe down the middle of the common 'Massangeana' is the bit most people recognize. It's from tropical Africa, but it's perfectly at home in a regular room and keeps a neat, upright shape for years.
Here's the nice part: it's a slow grower, and that's exactly why it's so low-key. A young cane is around 3 feet tall, and if you give it time and some headroom it'll climb well past your head, but it won't be in any hurry about it. So you won't be repotting or fussing over it much at all.
If there's one thing it won't put up with, it's bad water. The corn plant is really sensitive to fluoride and salts, and tap water shows up fast as brown, scorched leaf tips. Give it filtered water or rainwater, keep it warm and away from cold drafts, and honestly, that's about all it asks for.
Care
The short version: it likes bright indirect light but copes with low light, and you water it with fluoride-free water once the top of the soil dries out. Keep it warm above 50°F (10°C), feed it monthly in spring and summer, and it pretty much runs itself.
Light
Corn plants are happiest in bright indirect light, set back a bit from a hot window. They'll put up with medium light and even low light, though a dim corner does slow them down and thin out the leaves. Just keep them out of direct sun, since that scorches the foliage.
Water
Wait until the top of the soil dries before watering, keeping things evenly moist through spring and summer and easing off from fall to late winter, but never letting it go fully dry. The water itself is the big thing, though, because this plant really doesn't like fluoride or salts, so go with distilled, filtered, or rainwater and flush the pot every now and then. And skip cold water straight from the tap.
Soil
Pot it in a loamy, peaty, well-drained mix in something with drainage holes. Aim for a slightly acidic pH between 6.0 and 6.5, and steer clear of perlite and superphosphate, since those add the fluoride this plant can't deal with.
Temperature
Keep it warm, somewhere between 50°F and 81°F (10°C to 27°C), and don't let it drop below 50°F. Cold drafts and chilly windows are hard on the leaves, so bring it inside well before fall nights start getting cold.
Humidity
Average household humidity around 30% to 40% is plenty for it. If your air's drier than that, especially in winter, a bit of extra humidity helps keep those leaf tips from going brown.
Feeding
Feed it monthly through spring and summer with a liquid foliage houseplant fertilizer, and ease off in the colder months when growth slows down. Just avoid anything high in fluoride or superphosphate, since that's what burns the tips.
Pruning
When a cane gets leggy, cut it back to the height you want and new growth pops out from the cut, which is how you keep an older plant in check. Pull off the yellowed lower leaves as they age, and hang on to the trimmed tips and cane bits, because they'll root into new plants.
Repotting
Since it's such a slow grower, it only needs repotting every 1 to 2 years, or whenever it's clearly crowded. Keep an eye out for roots circling the pot or poking out the drainage holes, water running straight through, or growth stalling even with good care.
Size & spacing
Indoors it'll go from about 3 to 14 feet (91 cm to 4.5 m) tall over a lot of years, but stays narrow at just 1 to 3 feet (30 to 91 cm) across. That tall, slim shape is what makes it such an easy fit for a corner.
Troubleshooting
Most corn plant problems turn up either at the leaf tips or down in the roots, and almost all of them come back to water. Have a look at the early signs below, see which one matches what your plant's doing, and you can usually sort out the cause before it gets worse.
Mushy base, dark roots, and a nasty smell
That's root or soft rot, and it comes from too much water or a mix that won't drain. The roots go soft and brown, the lower leaves flop, and the plant can't drink even though the soil's wet. Stop watering, get it out of the pot, and cut away every soft root before repotting in fresh fast-draining mix in something with drainage holes. If it's rotted badly it won't bounce back, so just take a healthy tip cutting and start over.
Fix:
- Stop watering and let the soil dry
- Unpot, cut away soft brown roots, and repot in fresh fast-draining mix
- Discard severely affected plants (soft rot has no effective treatment) and start fresh from a healthy tip cutting
- Always use pots with drainage holes
Droopy, discolored leaves following a cold spell
This is cold injury, and it kicks in once the plant drops below 50°F (10°C) or sits in a draft. You'll usually see it after an open window, a chilly night, or a container left out as it cools off. Move it somewhere warm and away from cold glass, bring containers in during early fall, and wait for new growth before you cut off the spoiled leaves.
Fix:
- Move the plant to a warm spot away from drafts and cold windows
- Bring containers indoors in early fall before temperatures dip below 50°F
- Remove damaged foliage once new growth resumes
Sticky spots, cottony fluff, or little bumps across the leaves
These are the usual indoor pests, mostly mealybugs and scale, plus spider mites and thrips. Look for cottony white masses, raised bumps, fine webbing with stippled leaves, or silvery flecking, often sitting on a film of sticky honeydew. Wipe the pests off and dab mealybugs or scale with an alcohol-soaked swab, then treat with insecticidal soap or horticultural oil and repeat as needed. Keep the plant away from the others until it's clean.
Fix:
- Wipe off pests and honeydew; dab mealybugs/scale with alcohol on a cotton swab
- Treat with insecticidal soap or horticultural oil, repeating as needed
- Isolate the plant to prevent spread
- Increase humidity to discourage spider mites
Brown, burnt-looking tips and edges
This is almost always fluoride and salt damage, which is the corn plant's number-one complaint. Tap water, perlite, and superphosphate all carry fluoride the plant just can't get rid of, and it ends up burning the leaf tips and edges. Switch over to distilled, filtered, or rainwater, flush the pot now and then to clear out built-up salts, and keep the soil pH between 6.0 and 6.5. On 'Massangeana' the tell is a tan dead patch ringed with a bright yellow border along the edge.
Fix:
- Switch to distilled, filtered, or rainwater (fluoride below 1 ppm)
- Flush the pot periodically to leach out accumulated salts
- Maintain soil pH between 6.0 and 6.5 and avoid superphosphate and perlite amendments
- Raise humidity if household humidity is below 30-40%
- Trim damaged tips for appearance
Lower leaves yellowing and dropping off
A lot of the time this is just normal aging, since caned dracaenas drop their oldest, lowest leaves while the top keeps growing. But if loads of leaves yellow all at once or the soil stays soggy, think overwatering or a mix that drains too slowly. Pull off the spent leaves, let the surface dry between waterings, and move it somewhere brighter if the new leaves are coming in narrow and thin.
Fix:
- Remove spent lower leaves
- Check drainage and let the soil surface dry before rewatering
- Move to brighter indirect light if leaves are narrowing
Toxicity
The corn plant is toxic to cats and dogs, so it's worth thinking about where it goes. The leaves and sap have saponins in them, which upset an animal's stomach, so keep it out of reach of pets and grazing animals. People are basically fine around it, though the sap can leave sensitive skin a little irritated.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Moderate
Cats get hit hardest by the saponins. Keep an eye out for drooling, a lost appetite, and vomiting that can have flecks of blood in it, often with a flat, low mood. Dilated pupils are something you'll see in cats but not in dogs.
Dogs Moderate
A dog that chews the leaves tends to drool, go off its food, and throw up, sometimes with a little blood. A lot of them also go quiet and low for a bit while it passes.
Horses Moderate
The ASPCA lists the plant as toxic to horses through these same saponins. If a horse gets at the foliage, expect drooling, a poor appetite, and an upset stomach.
Rabbits Caution
Saponins aren't kind to a rabbit's gut, so keep the leaves off the menu. There's no safe little nibble here, and any chewing is worth a call to the vet.
Livestock Caution
Grazing animals like goats and sheep can take in the same saponins and end up with digestive upset. It's a houseplant they shouldn't be able to reach in the first place, really.
Birds Caution
A curious bird that pecks the foliage might swallow the saponins, so keep it well clear of the plant. If it does chew on it, that's a reason to ring an avian vet.
People Minimal
People are basically safe around it. The sap can leave some skin a little irritated, and a child who bites a leaf might get a quick upset stomach, but it isn't a serious poisoning risk.
Sap may cause skin irritation in people; the plant is toxic to humans if ingested per NC State Extension
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
A handful of cultivars go by the corn plant name, and what really tells them apart is the way their leaves are striped. Here are the ones you're most likely to come across.
'Massangeana' (corn plant / mass cane)
This is the one you'll see most, with broad evergreen leaves split by a wide central yellow stripe, and it's also where fluoride injury shows up as tan dead areas edged in bright yellow along the leaf margin.
'Lemon Lime'
It's got sword-shaped leaves up to about 2 feet long that mix cream, greenish-yellow, and lime stripes, and it sits in the Deremensis Group of D. fragrans.
'Janet Craig'
This dark green Deremensis Group cultivar shows its fluoride trouble as yellow or dead leaf tips instead of margin burn.
'Warneckii'
A white-striped Deremensis Group form where fluoride damage turns up as long tan to dark brown streaks running through the pale stripes.
How to propagate
Want more corn plants? They're easy to multiply, and those leggy canes you'd be trimming off anyway are exactly what you root into new plants.
Stem cuttingsEasy
Spring or late summer · Several weeks to root
The easiest way to get more corn plants is from cuttings taken in spring or late summer. You can use a tip cutting or a section of bare cane, and rooting the basal shoots works too. Stand the cutting in fresh mix and give it several weeks to root before it really settles in.
Air layeringModerate
Spring or summer · Several weeks
Air layering takes a little more patience, but it's great for a tall, leggy cane you'd rather not cut into blind. You wound the stem, wrap it up, and roots form right on the cane over several weeks in spring or summer before you cut it off and pot the rooted top.
Myths
A corn plant on the shelf really cleans VOCs out of the air.
Here's the reality: a 2020 review of chamber studies by Cummings and Waring found potted plants don't actually improve indoor air quality at any density you'd have at home. One plant clears so little air that you'd need somewhere between 10 and 1,000 plants per square meter just to match what normal ventilation already does. Keep it because you like it, not to clean the room.
Brown tips on a dracaena? That's just the calcium-oxalate burn aroids are famous for.
Not quite. Dracaena fragrans is in the Asparagaceae family, and its toxic compound is saponins, not the calcium oxalate you find in aroids. Those brown tips are usually about fluoride and salt sensitivity or dry air, not oxalate, so the answer is cleaner water rather than anything aimed at oxalate.