Corn Plant Care: How to Prevent Brown Tips on Dracaena

Overview

The Corn Plant (Dracaena fragrans, sometimes sold as Mass Cane) is a ubiquitous, tree-like houseplant prized for its thick, woody canes and long, arching, striped leaves that resemble corn foliage. It is a staple in offices, malls, and living rooms because it is incredibly forgiving of neglect and low light. However, almost every grower eventually faces the same frustrating cosmetic issue: the tips of the beautiful leaves turn brown and crispy. This guide will teach you the specific watering requirements and the crucial water quality adjustments needed to keep this reliable giant looking flawless.

Native to tropical Africa, the Corn Plant is an understory shrub that is accustomed to filtered light and periods of dry weather. The thick, woody stems (canes) store moisture, making the plant highly resilient to drought but extremely vulnerable to being suffocated in heavy, constantly wet indoor potting soil. The key to Dracaena care is understanding that "less is more" when it comes to watering and fertilizing.

Light

Corn Plants are highly adaptable to various lighting conditions. They look best and grow steadily in medium to bright indirect light, such as an east-facing window or a few feet away from a south-facing window. They can survive for years in low-light environments, like a dark corner or a fluorescent-lit office, but their growth will be incredibly slow and the vibrant yellow/green stripes on the leaves may fade. Direct, hot afternoon sunlight must be avoided, as it will scorch the foliage and cause large brown burn marks.

Temperature

This tropical plant prefers standard household temperatures between 65°F and 80°F (18°C - 27°C). It is sensitive to cold drafts. Prolonged exposure to temperatures below 55°F (13°C) will cause the leaves to curl, turn gray, and drop. Keep it away from drafty winter windows and out of the direct path of air conditioning vents.

Humidity

Dracaenas are very tolerant of standard indoor humidity levels (40% to 50%). While they will appreciate slightly higher humidity, a room humidifier is rarely necessary unless your home is exceptionally dry (under 30%) during the winter. You do not need to mist the leaves.

Watering and Water Quality

Water quality is the single most important factor in Dracaena care. They are notoriously sensitive to fluoride, chlorine, and heavy minerals found in municipal tap water. Using tap water is the primary cause of those frustrating brown, crispy leaf tips. To prevent this, you must water your Corn Plant with distilled water, rainwater, or water purified by reverse osmosis. Regarding frequency, you must let the soil dry out significantly between waterings. Allow the top 50% of the potting mix to dry out completely. In a large 10-inch or 12-inch pot, this usually means watering only once every two to three weeks. When you do water, soak the soil thoroughly until water runs out the drainage holes, but never let the pot sit in a saucer of standing water.

Soil

A standard indoor potting mix is generally fine, but because it is crucial that the soil dries out between waterings, amending the mix with 20% to 30% perlite or pumice will vastly improve drainage. Heavy, water-retaining soils will cause the thick canes to rot.

Fertilizer

Corn Plants are very slow growers and require minimal feeding. Furthermore, they are highly sensitive to a buildup of fertilizer salts in the soil, which will burn the roots and cause brown leaf tips. Feed sparingly. Apply a balanced liquid houseplant fertilizer diluted to quarter strength only once or twice a year during the spring and summer. Do not fertilize during the fall and winter.

Propagation

Propagating a Dracaena is easy and is a great way to rejuvenate a plant that has grown too tall and "leggy." You can propagate via stem cuttings. Simply cut the leafy top off the plant (leaving a few inches of bare stem attached). Let the cut end dry for a day, then place it in water or directly into moist potting mix to root. The original cane that you cut the top off of will sprout new growth points just below the cut, resulting in a branched, bushier plant.

Repotting

Because they grow so slowly and have a relatively small root system compared to their height, Corn Plants rarely need repotting. You generally only need to repot every three to five years, or when the roots are severely circling the bottom of the pot. When repotting, use a heavy pot (like terracotta or ceramic) that is only one or two inches wider in diameter; the weight will prevent the top-heavy plant from tipping over.

Toxicity

The Corn Plant is toxic to cats and dogs. It contains toxic saponins. If a pet chews on the leaves, it will cause gastrointestinal upset, vomiting (sometimes with blood), excessive drooling, and depression. Keep the plant out of reach of pets that are known to actively chew on houseplants.

Common Problems

Brown, crispy leaf tips are almost always caused by fluoride in tap water or a buildup of fertilizer salts. Switch to distilled water. You can safely trim the brown tips off with sterilized scissors. Yellowing, dropping lower leaves are a normal part of the plant's aging process as it grows a bare trunk. However, if multiple leaves turn yellow rapidly, or if the woody cane feels soft and squishy at the base, the plant is suffering from stem rot due to chronic overwatering.