aglaonema

Cause

Chinese evergreen (Aglaonema commutatum, A. modestum, A. pictum) develops brown leaf tips and brown leaf margins when the surrounding indoor air is too dry for the tropical understory species, because the plant prefers higher humidity than a typical heated living room provides and the leaf margins desiccate before the rest of the blade shows stress, even though the rhizomes still need the top of the potting medium to dry only 1 to 2 inches between waterings rather than being kept constantly wet.

Solutions

• Mist the foliage of chinese evergreen twice a week with a spray bottle of water on a mist setting whenever indoor humidity is very dry, focusing on the undersides of the leaves where moisture is absorbed most readily.
• Set the pot on a pebble tray filled with water so evaporation raises the ambient humidity around the central crown without waterlogging the substrate, since chinese evergreens also prefer higher humidity than typical heated rooms provide.
• Water only when the top 1 to 2 inches of the potting medium become dry to the touch, then water thoroughly so excess drains from the bottom of the pot.

Cause

Pleasant's troubleshooting entry for Aglaonema commutatum names mealybugs as an established pest, with white cottony insect colonies forming on stems and leaf undersides of the Chinese evergreen. These soft-bodied sap-sucking insects colonize leaf axils and shaded tissue, draining plant fluids and excreting sticky honeydew that invites secondary sooty mold on the surrounding glossy foliage.

Solutions

• Isolate the infested Chinese evergreen immediately from other houseplants to prevent crawlers from migrating onto neighboring specimens.
• Remove visible mealybugs with cotton swabs dipped in 70 percent isopropyl alcohol, repeating every 3 days until the white cottony masses stop reappearing.
• After testing a single leaf for tolerance, spray the entire plant including stem crotches and leaf undersides with insecticidal soap; reapply weekly for at least 3 weeks to catch newly hatched nymphs.

Cause

Scale insects are described as the most serious insect pest of Aglaonema in Pleasant's Complete Houseplant Survival Manual. They appear as small disc-shaped creatures clinging to stems and the undersides of the Chinese evergreen's glossy leaves, weakening the plant by siphoning sap from vascular tissue while plants appear weak despite normal watering.

Solutions

• Dispose of badly infested plants if the scale population has spread across most stems and leaf undersides, since heavy infestations are usually not worth saving.
• For light infestations, isolate the plant immediately and gently scrape scales off with a fingernail or soft brush; repeat every few days before any spray treatment.
• Spray the entire plant, including leaf undersides and stem crotches, with insecticidal soap after testing a single leaf for tolerance; reapply every 7 to 10 days to kill newly mobile crawlers.

Cause

Nissen's Indoor Plant Bible lists Aglaonema commutatum as susceptible to spider mites alongside aphids, scale insects, and mealy bugs. These tiny arachnids pierce individual cells on the leaf undersides of the Chinese evergreen and drain chlorophyll-bearing tissue, producing a stippled, faded appearance that progresses to fine webbing in heavy infestations during dry indoor air.

Solutions

• Increase ambient humidity around the plant by misting the foliage with room-temperature water or placing the pot on a pebble tray filled with water to discourage dry-air mite flare-ups.
• Spray the entire plant, including leaf undersides, with insecticidal soap after testing for tolerance on a single leaf; reapply weekly for 3 to 4 weeks to interrupt the mite life cycle of eggs, larvae, and adults.
• Rinse the foliage under a gentle stream of lukewarm water to physically dislodge mites and webbing from the leaf surfaces before applying any spray treatment.

Cause

Chinese Evergreen (Aglaonema) in low light conditions has severely reduced transpiration and photosynthesis rates, meaning root water uptake slows proportionally — wet soil becomes anaerobic within 72 hours.

Solutions

• 1. Dark-green varieties: water when top 1-2 inches of soil are dry
• 2. Pink/red/variegated hybrids: keep evenly moist in bright indirect light to preserve coloration
• 3. In low light, Aglaonema loses color and becomes more drought-tolerant — reduce watering frequency
• 4. Use pebble trays to raise humidity; brown leaf tips indicate dry air or salt buildup
• 5. Cut off flower spikes (spadix) so energy goes to foliage rather than seeds
• 6. Toxic to dogs and cats — keep out of reach

Cause

Aglaonema species succeed as houseplants through CAM-like water storage adaptations and tolerance for variable light conditions. Care failures typically stem from overwatering in low-light conditions where transpiration is reduced, or mineral buildup from tap water causing leaf edge burn.

Solutions

• Position in bright indirect light; east or west-facing windows ideal
• Water thoroughly only when soil is 50-70% dry; use moisture meter for precision
• Use filtered or distilled water to prevent fluoride/chlorine toxicity
• Repot every 2-3 years in fresh well-draining mix
• Remove yellowing lower leaves promptly to redirect energy
• Monitor for pests monthly, especially spider mites in dry conditions