Chinese Evergreen Care: Aglaonema Light and Water

Chinese evergreen wants low to moderate indirect light, a mix that stays moist through the growing season, and a room that does not drop below 55 F. NC State Extension places Aglaonema in deep to partial shade - less than six hours of direct sun - and says it does well in diffuse sun or good indirect light. Clemson Extension is more specific on water: keep the soil moist, allowing the top one to two inches to dry before watering again, using room temperature water.

Temperature is where this plant is fussy. NC State says it prefers a daytime range of 70 to 80 F and is intolerant of cold; Clemson gives an optimum of 68 to 80 F, a minimum tolerance around 55 F, and notes sensitivity below 50 F.

It is toxic to pets. Our guide to houseplants and cats covers what to do.

Not all Chinese evergreens tolerate the same light. Clemson makes the distinction that matters: solid green types tolerate low light conditions, while direct sunlight should be avoided by all of them. The heavily marked pink and red cultivars sold today carry less green tissue, so they need more light to hold the same growth rate.

NC State places the genus in deep shade to partial shade, defined as less than six hours of direct sun, and describes it as doing well in diffuse sun or good indirect light.

For a figure to aim at, Clemson's indoor plant categories set low light at a preferred 75 to 200 foot-candles and medium at 200 to 500, and note that a foliage plant needs at least 200 foot-candles for twelve hours a day to benefit from being fertilised at all.

Clemson's instruction is to keep the soil moist and let the top one to two inches dry before watering again, using room temperature water and avoiding extremes. NC State frames the same thing seasonally: keep the potting mix moist from spring to autumn, allow the medium to dry between waterings, and reduce watering in winter.

For mix, Clemson recommends a commercial soilless mix with extra humus, in a container with drainage holes. NC State lists clay, loam or sand with good drainage at an acidic pH below 6.0.

Root rot from poor drainage or overwatering is the disease both sources name first, with powdery mildew appearing in high humidity per Clemson. Water thoroughly until it drains from the bottom, then empty the saucer - Clemson's general watering sheet warns against ever leaving a pot standing in water.

These two are constantly confused in shops, and the giveaway is on the leaf. NC State's Dieffenbachia entry states the test directly: Dieffenbachia has more than eight main lateral veins, usually around twenty, while Aglaonema has five to eight. Count the big side veins running from the midrib to the leaf edge.

NC State describes Aglaonema leaves as lance-shaped, four to twelve inches long and two to four inches wide, green with yellow, cream, grey, pink or red variegation, on an erect stem that becomes sugarcane-like with age.

The distinction is not cosmetic. NC State rates Aglaonema toxicity low and Dieffenbachia high, so knowing which plant is on your shelf changes how careful you need to be around children and pets. If you are unsure, photograph the whole plant and a leaf close-up in even light and let the app read the species first.

Clemson notes that excessive fertiliser causes leaf edge burn, which is the main thing to know about feeding this plant. Clemson's general indoor plant guidance for foliage plants is a balanced 20-20-20, applied every two to three months at label strength, or heavily diluted at each watering through the growing season, and not at all during winter dormancy.

For propagation Clemson lists five routes: division, stem cuttings, tip cuttings, air layering and seed. NC State lists division and stem cuttings. Division at repotting is the simplest.

Problems, per Clemson: mealybugs, aphids, scale and mites among the pests; root rot from poor drainage or overwatering; powdery mildew in high humidity. NC State adds brown leaves in dry air or drafts. Keep it away from heating vents and doorways.

Chinese evergreen is toxic to cats and dogs. NC State rates the severity low, names calcium oxalate crystals as the toxic compound, and lists bark, flowers, fruits, leaves, roots, seeds and stems among the affected parts. The recorded signs are difficulty swallowing, irritation of the mouth and throat, vomiting, drooling, rash and dermatitis, and NC State notes the concern is greater for pets than for humans. Clemson simply says the leaves can be toxic to pets, particularly dogs and cats, and to keep pets away.

One common name recorded by NC State - poison dart plant - is worth ignoring as a guide to danger; the veins-and-severity comparison with Dieffenbachia above is the useful one.

If a pet has eaten some, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435; for a person, Poison Control on 1-800-222-1222.

Yes, for low-light rooms it is one of the more forgiving choices, provided pets and children cannot chew it. Costa Farms, a grower, says it tolerates low light well, grows well in bright spots too, and does fine in offices under fluorescent lighting. Proven Winners describes it as slow growing, reaching 1 to 3 feet tall and wide indoors. Given enough light it produces small calla-lily-like blooms, per Costa Farms.

It is toxic, as the pet section above explains; Proven Winners also advises gloves when pruning because the sap irritates skin.

It needs light but not sun. Proven Winners recommends low to medium indirect light near an east-facing window, out of direct sun, which damages the leaves, and away from draughts and temperature swings. Costa Farms goes further and says no natural sunlight is needed at all.

The cultivar decides how much light is enough. Proven Winners says green-leaved varieties tolerate low light while variegated types need medium indirect light to keep their colour. Among the cultivars Costa Farms lists are 'Silver Queen', 'Maria', 'Romeo', 'Golden Bay' and 'Slim Jim'. Proven Winners puts the comfortable range at 65 to 80 F and says temperatures below 60 F cause stress and cold damage.

Proven Winners says water every 7 to 10 days in the growing season, after checking that the top 1 to 2 inches are dry, and less in winter. Costa Farms says the plant copes equally with evenly moist soil or a watering every few weeks. Both can be true because they describe different homes; the finger test is what to follow.

Feeding varies more. Proven Winners feeds monthly in spring and summer and stops in autumn and winter; Costa Farms says once or twice a year is enough. Clemson, quoted above, warns that excess fertiliser burns the leaf edges, so the lower end of that range is the safer starting point.

• Yellow leaves. Proven Winners lists overwatering, underwatering, too much direct sun and nutrient deficiency. Overwatering specifically shows as yellow, wilted, curled or dropped leaves, with root rot beneath.
• Brown leaf edges. Excess fertiliser (Clemson), or dry air and cold draughts (NC State), as covered above.
• Faded variegation. Too little light for a variegated cultivar, per Proven Winners.
• Cold damage. Below 60 F, per Proven Winners.
• Repotting. Proven Winners repots every two to three years in spring or summer into a pot 1 to 2 inches wider, using a rich, free-draining mix with orchid bark and perlite.

The sections on placement, watering disagreements and common problems were added on 2026-09-25. Research and drafting were done with the help of AI, and every figure was checked line by line against the sources listed on this page.