Why Aglaonema Leaves Turn Yellow During Seasonal Changes: 5 Common Causes and Expert Fixes for Beginners (2026 Update)

Ever had this happen? Yesterday your Aglaonema on the work desk was lush and green, then the rain arrives or the air turns cooler, and a few lower leaves are suddenly yellow. It is a heart-sinking moment. This article covers yellowing leaves on Aglaonema (Aglaonema spp.) during seasonal changes. The short answer: the main causes are watering that does not match changing soil moisture, falling temperatures, and lower light, not serious disease. Most cases can be fixed at home.

Why Aglaonema Leaves Turn Yellow During Seasonal Changes

Aglaonema is a tropical plant from Southeast Asia that prefers roughly 20-30 degrees Celsius. When seasons shift and the air gets more humid or cooler, soil dries more slowly and roots absorb less water. If you keep watering the same amount, the roots suffocate and the lower leaves yellow first. One or two yellow lower leaves is a normal adjustment, but many leaves yellowing at once needs a closer check.

The 5 Most Common Causes

• Overwatering in rainy or humid weather, leaving soggy soil and starting root rot
• Temperatures below 15 degrees Celsius, especially air conditioner drafts blowing directly in an office. He really dislikes cold blasts
• Less light during the rainy season, so the plant drops old leaves to save energy
• Low air humidity in cool season or air-conditioned rooms, causing yellow, crispy leaf edges
• Too much or too little fertilizer: pale yellow leaves from nitrogen deficiency, or burnt edges from strong fertilizer

Step-by-Step Fix for Yellowing Aglaonema Leaves

Step 1: Check the soil before every watering

Poke a finger 2-3 centimeters into the soil. If it is still cool and damp, do not water yet. In the rainy season, about once a week is usually enough, while in hot weather the soil may dry in 3-4 days. He prefers soil that is slightly moist over soggy soil.

Step 2: Inspect the roots if you suspect rot

Slide the plant out of its pot. Healthy roots are white to cream and firm. If roots are dark brown, mushy and smelly, cut away the damaged parts with scissors wiped with alcohol and repot in airy, well-draining mix, such as potting soil blended with perlite or burnt rice husk, in a pot with drainage holes.

Step 3: Move him to a better spot

• Place in bright, indirect light, bright enough to read a book, but away from harsh direct sun
• Keep at least 1-2 meters from air conditioner vents
• In a condo, put him near a window with a sheer curtain to filter light

Step 4: Trim yellow leaves and pause fertilizer

A fully yellow leaf will not turn green again. Cut it off close to the stem base so the plant can put energy into new growth. While he recovers, skip fertilizer for 3-4 weeks, then resume a balanced fertilizer diluted to half strength once a month.

Summary Table: Symptoms, Causes and Fixes

Symptom	Likely cause	Fix
Lower leaves yellow, soil soggy	Overwatering	Water less often, check soil first
Leaf edges yellow and crispy	Dry air, AC draft	Move away from AC, raise humidity around the plant
Whole plant pale yellow	Low light or nutrient shortage	Move near a window, feed with diluted fertilizer
Soft stems, smelly base	Root rot	Unpot, trim damaged roots, repot

Myths You Should Stop Believing

Many people see yellow leaves and rush to add water, thinking the plant is thirsty. This is wrong very often. From over 10 years of growing and shipping plants, most Aglaonema that customers ask about with yellow leaves suffered from too much water rather than too little. Another mistake is adding strong fertilizer to a sick plant, which damages the roots further. Restore the roots first, then feed.

For homes with dogs or cats, a little caution please. Aglaonema contains calcium oxalate crystals in its leaves, which can irritate the mouth if chewed. Place him on a high shelf out of reach.

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Is it normal for only the lower leaves of Aglaonema to turn yellow?

Yes, it is normal. If only 1-2 lower leaves yellow and new leaves are still green, it is natural leaf shedding as he adjusts to the season. Remove the yellow leaves, adjust watering, and observe for 2-3 weeks. If the yellowing spreads fast, check the roots.

How often should I water Aglaonema in the rainy season?

About once a week, but rely on soil moisture rather than a fixed number of days. Poke the soil 2-3 centimeters deep, and if it is still damp, wait. In a condo with still air, soil dries slowly, so you may need even longer gaps.

Can a yellow leaf turn green again?

No, a fully yellow leaf will not turn green again. But a plant with healthy roots will push out new leaves within a few weeks to a couple of months, depending on temperature and light. Cut off the yellow leaf and fix the real cause.

Does Aglaonema like sun?

He does not like harsh direct sun. He prefers bright indirect light. Strong afternoon sun can scorch and fade the leaves, while too little light dulls the color and slows growth. A window with a sheer curtain is the sweet spot.

If your Aglaonema is too far gone to fix on your own, or you want a healthy new plant for your desk or condo corner, message Pama anytime. We are happy to be your plant doctor, and you can adopt a new buddy to bring some healing home 🌿