Houseplant · Asparagaceae
Corn Plant
Dracaena fragrans
Forgiving in low light and slow to outgrow a room, the corn plant only asks for clean water and warmth.
Bright indirect
50–81°F · 10–27°C
USDA 10–12
3–14 ft · 0.9–4.4 m
Overview
The corn plant earns its place indoors by being hard to kill. It grows from a thick, woody cane topped with arching, strappy leaves, and the broad central yellow stripe of the common 'Massangeana' is what most people picture. Native to tropical Africa, it settles into ordinary rooms and keeps a tidy, upright shape for years.
It is a slow grower, which is part of its charm as a houseplant. A young cane stands around 3 feet tall, and given enough time and ceiling it can stretch well past head height, but it takes its time getting there. That patience means you rarely have to repot or fuss with it.
The one thing it won't forgive is bad water. The corn plant is very sensitive to fluoride and salts, and tap water shows up fast as scorched, brown leaf tips. Give it filtered or rainwater, keep it warm and out of cold drafts, and it asks for little else.
Care
The short version: bright indirect light, but it copes with low light, watered with fluoride-free water once the top of the soil dries. Keep it warm above 50°F (10°C), feed monthly in spring and summer, and it largely takes care of itself.
Light
Corn plants do best in bright indirect light, well back from a hot window. They tolerate medium light and even low light, though dim corners slow them down and narrow the leaves. Keep them out of direct sun, which scorches the foliage.
Water
Water once the top of the soil dries, keeping it evenly moist through spring and summer and easing off from fall to late winter without ever letting it dry out completely. The big rule is the water itself: this plant is very sensitive to fluoride and salts, so use distilled, filtered, or rainwater and flush the pot now and then. Skip cold water straight from the tap.
Soil
Plant in a loamy, peaty, well-drained potting mix in a pot with drainage holes. Aim for a slightly acidic pH between 6.0 and 6.5, and steer clear of perlite and superphosphate, which add the fluoride this plant can't handle.
Temperature
Keep it warm, ideally between 50°F and 81°F (10°C to 27°C), and never let it drop below 50°F. Cold drafts and chilly windows damage the leaves, so move it inside well before fall nights turn cold.
Humidity
Average household humidity around 30% to 40% suits it fine. If your air runs drier than that, especially in winter, a little extra humidity helps keep the leaf tips from browning.
Feeding
Feed monthly through spring and summer with a liquid foliage houseplant fertilizer, and hold off in the colder months when growth slows. Avoid any feed high in fluoride or superphosphate, which burns the leaf tips.
Pruning
Cut a leggy cane back to the height you want and new growth pushes from the cut, which is how you keep an old plant in bounds. Strip off the yellowed lower leaves as they age, and save the trimmed tips and cane sections to root into new plants.
Repotting
This slow grower needs repotting only every 1 to 2 years, or when it's clearly crowded. Watch for roots circling the pot or poking from the drainage holes, water running straight through, or growth stalling despite good care.
Size & spacing
Indoors a corn plant runs from about 3 to 14 feet (91 cm to 4.5 m) tall over many years, with a narrow spread of just 1 to 3 feet (30 to 91 cm). That upright, slim footprint is what makes it an easy fit in a corner.
Troubleshooting
Most corn plant trouble starts at the leaf tips or the roots, and nearly all of it traces back to water. Read the early signs below, match them to what your plant is doing, and fix the cause before it spreads.
Mushy stem base, soft brown roots, and a foul smell
This is root or soft rot, and it comes from too much water or a mix that won't drain. The roots turn soft and brown, the lower leaves collapse, and the plant can't drink even though the soil is wet. Stop watering, unpot it, and cut away every soft root before repotting in fresh fast-draining mix in a pot with drainage holes. A badly rotted plant won't recover, so 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
Drooping, discolored leaves after a cold snap
Cold injury sets in once the plant dips below 50°F (10°C) or sits in a draft. The damage shows up after an open window, a chilly night, or a container left out as temperatures fall. Move it somewhere warm and away from cold glass, bring containers indoors in early fall, and wait for new growth before cutting 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 residue, cottony fluff, or small bumps on the leaves
These are the usual indoor pests, mainly mealybugs and scale, along with spider mites and thrips. Look for cottony white masses, raised bumps, fine webbing with stippled leaves, or silvery flecking, often over 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 apart 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, scorched tips and edges on the leaves
Almost always this is fluoride and salt damage, the corn plant's most common complaint. Tap water, perlite, and superphosphate all carry fluoride that the plant can't shed, and it burns the leaf tips and margins. Switch to distilled, filtered, or rainwater, flush the pot now and then to wash out built-up salts, and keep the soil pH between 6.0 and 6.5. On 'Massangeana' the giveaway 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 turning yellow and falling off
Some of this is just normal aging, since caned dracaenas shed their oldest, lowest leaves as the top keeps growing. If many leaves yellow at once or the soil stays soggy, suspect overwatering or a mix that drains too slowly. Pull the spent leaves, let the surface dry between waterings, and move the plant brighter if the new leaves look 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. The leaves and sap hold saponins, which upset an animal's stomach, so keep it out of reach of pets and grazing animals. People are essentially safe, though the sap can leave sensitive skin a little irritated.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Moderate
The saponins hit cats hardest. Watch for drooling, a lost appetite, and vomiting that can carry flecks of blood, often with a flat, depressed mood. Dilated pupils are a sign seen in cats but not in dogs.
Dogs Moderate
A dog that chews the leaves tends to drool, go off its food, and vomit, sometimes with a little blood. Many also turn quiet and low for a while as it passes.
Horses Moderate
ASPCA lists the plant as toxic to horses through the same saponins. Expect drooling, a poor appetite, and stomach upset if a horse gets at the foliage.
Rabbits Caution
Saponins are no friend to a rabbit's gut, so keep the leaves off the menu. There's no safe 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 reach in the first place.
Birds Caution
A curious bird that pecks the foliage may swallow the saponins, so keep it well clear of the plant. Treat any chewing as a reason to ring an avian vet.
People Minimal
People are essentially safe around it. The sap can leave some skin a little irritated, and a child who bites a leaf might get a brief 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
Several cultivars share the corn plant name, and they differ mostly in how their leaves are striped. These are the ones you'll come across most.
'Massangeana' (corn plant / mass cane)
The most common form, with broad evergreen leaves split by a wide central yellow stripe, and the one where fluoride injury reads as tan dead areas edged in bright yellow along the leaf margin.
'Lemon Lime'
Sword-shaped leaves up to about 2 feet long that mix cream, greenish-yellow, and lime stripes, part of the Deremensis Group of D. fragrans.
'Janet Craig'
A dark green Deremensis Group cultivar whose fluoride trouble turns up as yellow or dead leaf tips rather than margin burn.
'Warneckii'
A white-striped Deremensis Group form where fluoride damage shows as long tan to dark brown streaks running through the pale stripes.
How to propagate
Corn plants are easy to multiply, and the leggy canes you'd otherwise prune are exactly what you root into new plants.
Stem cuttingsEasy
Spring or late summer · Several weeks to root
The easiest way to make more corn plants is from cuttings taken in spring or late summer. 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 put out roots before it settles in.
Air layeringModerate
Spring or summer · Several weeks
Air layering takes a bit more patience but suits a tall, leggy cane you'd rather not cut blind. Wound the stem, wrap it, and roots form on the cane itself over several weeks in spring or summer before you sever and pot the rooted top.
Myths
Corn plant and other houseplants meaningfully clean the air of VOCs.
A 2020 review of chamber studies by Cummings and Waring found potted plants do not improve indoor air quality at any realistic density. A single plant's clean air delivery rate is so small you would need somewhere between 10 and 1,000 plants per square meter to match what normal building ventilation already does. Grow it because you like it, not to filter the room.
Brown dracaena leaf tips are the same calcium-oxalate burn that aroids cause.
Dracaena fragrans sits in the Asparagaceae family, and its toxic compound is saponins, not the calcium oxalate found in aroids. The usual cause of brown tips is fluoride and salt sensitivity or dry air, not oxalate irritation, so the fix is cleaner water rather than anything aimed at oxalate.