Houseplant · Asparagaceae
Corn Plant
Dracaena fragrans
Easygoing in a low-light corner and slow to outgrow its spot, the corn plant really only wants clean water and a little warmth.
Bright indirect
50–81°F · 10–27°C
USDA 10–12
3–14 ft · 0.9–4.4 m
Overview
If you are nervous about keeping a plant alive, the corn plant is a kind one to start with. It grows from a sturdy, woody cane crowned by long, arching leaves, and the wide yellow stripe down the middle of the familiar 'Massangeana' is the look most people know. It comes from tropical Africa, yet it settles happily into an ordinary room and holds its upright shape for years with very little from you.
Take comfort in how slowly it grows, because that pace is on your side. A young cane stands about 3 feet tall, and with time and a bit of headroom it can climb past your head, but it will never rush. You will hardly ever need to repot it or hover over it, which leaves plenty of room for small mistakes.
There is really only one thing to get right, and it is the water. The corn plant is quite sensitive to fluoride and salts, and ordinary tap water tends to brown the leaf tips before long. Offer it filtered water or rainwater, keep it cozy and away from cold drafts, and you will find it asks for almost nothing else.
Care
The short version: give it bright indirect light, though it forgives low light, and water it with fluoride-free water once the top of the soil feels dry. Keep it warm above 50°F (10°C), feed it monthly in spring and summer, and it will mostly look after itself.
Light
Your corn plant will be happiest in bright indirect light, set back a little from a hot window. It also gets by in medium light and even low light, though a dim corner slows it down and thins out the leaves. Just keep it clear of direct sun, which can scorch the foliage.
Water
Wait until the top of the soil dries before you water, keeping it evenly moist through spring and summer and easing back from fall to late winter, without ever letting it go bone dry. The one thing to watch is the water itself, since this plant is sensitive to fluoride and salts, so reach for distilled, filtered, or rainwater and flush the pot now and then. It is best to skip cold water straight from the tap.
Soil
Settle it into a loamy, peaty, well-drained potting mix in a pot that has drainage holes. A slightly acidic pH between 6.0 and 6.5 suits it well, and it helps to avoid perlite and superphosphate, which add the fluoride this plant cannot handle.
Temperature
Keep it comfortable and warm, somewhere between 50°F and 81°F (10°C to 27°C), and try never to let it dip below 50°F. Cold drafts and chilly window glass can hurt the leaves, so bring it in well before the autumn nights turn cold.
Humidity
Ordinary household humidity of around 30% to 40% is plenty for this plant. If your air runs drier than that, especially over winter, a little added moisture goes a long way toward keeping those leaf tips from browning.
Feeding
A light feed once a month through spring and summer with a liquid foliage houseplant fertilizer is all it needs, and you can stop in the cooler months when growth quiets down. Steer clear of any feed high in fluoride or superphosphate, since that is what scorches the tips.
Pruning
When a cane grows leggy, cut it back to the height you like and fresh growth sprouts from the cut, which is how an older plant stays in bounds. Pinch off the yellowed lower leaves as they age, and hold on to the trimmed tips and cane pieces, because they root into brand new plants.
Repotting
Being such a slow grower, it only wants repotting every 1 to 2 years, or whenever it looks truly crowded. Keep an eye out for roots circling the pot or peeking from the drainage holes, water rushing straight through, or growth stalling even with good care.
Size & spacing
Indoors a corn plant rises from roughly 3 to 14 feet (91 cm to 4.5 m) over many patient years, while staying slim at just 1 to 3 feet (30 to 91 cm) across. That tall, narrow shape is what makes it such an easy guest in a corner.
Troubleshooting
Most worries with a corn plant show up at the leaf tips or down in the roots, and nearly all of them come back to water, so try not to panic. Look over the early signs below, find the one your plant is showing, and you can usually set it right before it spreads.
A soft stem base, browned roots, and a bad odor
This one is root or soft rot, and it follows too much water or a mix that will not drain. The roots go soft and brown, the lower leaves give way, and the plant cannot drink even with wet soil around it. Stop watering, lift it out, and trim off every soft root before potting it into fresh fast-draining mix in a pot with drainage holes. If the rot has gone too far the plant will not bounce back, so take a healthy tip cutting and begin again.
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
Drooping, off-color leaves once it turns cold
Cold injury takes hold once the plant slips below 50°F (10°C) or sits in a draft. You will spot it after an open window, a cold night, or a container left out as the temperature falls. Move it somewhere warm and away from cold glass, carry containers inside in early fall, and wait for fresh growth before you trim 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 film, cottony tufts, or tiny bumps on foliage
These are the everyday indoor pests, mostly mealybugs and scale, with spider mites and thrips turning up too. Look for cottony white masses, raised bumps, fine webbing over stippled leaves, or silvery flecking, often sitting on a film of sticky honeydew. Wipe the pests away and touch mealybugs or scale with an alcohol-soaked swab, then treat with insecticidal soap or horticultural oil and repeat as needed. Keep the plant on its own until it is clean again.
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, crisped leaf tips and margins
Nine times out of ten this is fluoride and salt damage, the complaint corn plants run into most. Tap water, perlite, and superphosphate all carry fluoride the plant cannot shed, and it burns the tips and edges of the leaves. Switching to distilled, filtered, or rainwater fixes the root of it, and flushing the pot once in a while clears out built-up salts while you hold the soil pH between 6.0 and 6.5. On 'Massangeana' the telltale sign is a tan dead patch ringed by a bright yellow border along the margin.
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
Yellowing lower leaves that drop away
Quite often this is simply normal aging, because caned dracaenas let go of their oldest, lowest leaves while the top keeps reaching upward. If a lot of leaves yellow together or the soil stays soggy, overwatering or a slow-draining mix is the more likely culprit. Pull off the spent leaves, let the surface dry between waterings, and shift the plant 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 is worth a careful spot. Its leaves and sap hold saponins, which unsettle an animal's stomach, so keep it where curious pets and grazing animals cannot reach. People are essentially safe around it, though the sap can leave tender skin feeling a little irritated.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Moderate
Cats feel the saponins the hardest. Keep an eye out for drooling, a fading appetite, and vomiting that can carry flecks of blood, often alongside a flat, low mood. Dilated pupils are one sign you see in cats but not in dogs.
Dogs Moderate
A dog that chews the leaves usually drools, turns away from food, and vomits, now and then with a little blood. Many also grow quiet and subdued for a while until it passes.
Horses Moderate
The ASPCA lists the plant as toxic to horses through these same saponins. If a horse reaches the foliage, expect drooling, a poor appetite, and an upset stomach.
Rabbits Caution
Saponins do a rabbit's gut no favors, so it is best to keep the leaves well off the menu. There is no safe little nibble here, and any chewing is worth a call to the vet.
Livestock Caution
Grazing animals such as goats and sheep can take in the same saponins and end up with digestive upset. Really it is a houseplant they should never be able to reach in the first place.
Birds Caution
A curious bird that pecks at the foliage may swallow the saponins, so keep it well away from the plant. Treat any chewing as good reason to ring an avian vet.
People Minimal
People are essentially safe in its company. The sap can leave some skin feeling a little irritated, and a child who bites a leaf might get a brief stomach ache, but it is not 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 few cultivars share the corn plant name, and what sets them apart is mostly the way their leaves are striped. These are the ones you are most likely to meet.
'Massangeana' (corn plant / mass cane)
This is the form you will see most, with broad evergreen leaves divided by a wide central yellow stripe, and it is also the one where fluoride trouble appears as tan dead patches edged in bright yellow along the leaf margin.
'Lemon Lime'
Its sword-shaped leaves reach up to about 2 feet long and blend cream, greenish-yellow, and lime stripes, placing it in the Deremensis Group of D. fragrans.
'Janet Craig'
A deep green member of the Deremensis Group, this one signals fluoride trouble through yellow or dead leaf tips rather than burn along the margins.
'Warneckii'
A white-striped form from the Deremensis Group, where fluoride damage reads as long tan to dark brown streaks running down the pale stripes.
How to propagate
Making more corn plants is easier than you might expect, and the leggy canes you would trim away anyway are exactly the pieces you root into fresh plants.
Stem cuttingsEasy
Spring or late summer · Several weeks to root
The simplest way to raise more corn plants is from cuttings taken in spring or late summer. You can use a tip cutting or a length of bare cane, and rooting the basal shoots works nicely as well. Stand the cutting in fresh mix and give it several weeks to root before it truly settles in.
Air layeringModerate
Spring or summer · Several weeks
Air layering asks for a touch more patience and suits a tall, leggy cane you would rather not cut into blind. Wound the stem, wrap it, and over several weeks in spring or summer roots form right on the cane before you sever and pot the rooted top.
Myths
A corn plant will scrub the VOCs out of your room's air.
A 2020 review of chamber studies by Cummings and Waring found potted plants do nothing measurable for indoor air quality at any density a home would have. One plant clears so little air that you would need somewhere between 10 and 1,000 plants per square meter to match what ordinary ventilation already manages. Keep it because it brings you joy, not to scrub the room.
Those brown dracaena tips come from oxalate, the very burn aroids are known for.
Dracaena fragrans belongs to the Asparagaceae family, and the compound that makes it toxic is saponins, not the calcium oxalate aroids carry. Those brown tips almost always come from fluoride and salt sensitivity or dry air, not oxalate, so cleaner water is the answer rather than anything aimed at oxalate.