Common Autumn Houseplant Problems (and How to Fix Them)

The Likely Culprit: Overwatering

As your plant's growth slows for the dormant season, it uses far less water. If you keep watering on your summer schedule, the soil stays soggy, suffocating the roots. This leads to the classic signs of overwatering and root rot: soft, yellowing leaves, especially the lower ones.

The Fix: Ditch the schedule and get hands-on. Before watering, always check the soil by sticking your finger two inches deep. If it's moist, wait. Let the soil tell you when it's thirsty.

Fine‑tune cadence with Adjusting Watering and Fertilizer in Autumn.

The Other Possibility: Natural Shedding

It's also perfectly normal for a plant to sacrifice a few of its oldest, bottom leaves to conserve energy for the winter. If it’s just one or two leaves and the rest of the plant looks healthy, you have nothing to worry about.

The Likely Culprit: Temperature Shock

Is your plant near a window you've started opening for that crisp autumn air? Or is it right in the path of a heating vent that just kicked on for the first time? These sudden blasts of cold or hot air are a major source of stress, causing your plant to drop perfectly healthy-looking leaves.

The Fix: Assess your plant's location. Move it away from drafty windows, doors, and direct heat sources. Plants crave stability, so a spot with a consistent temperature is best. For more details, check out our guide on leaf drop.

Optimize window direction and distance in Light for Houseplants in Autumn. If you recently moved plants inside, follow Preparing Houseplants for Winter.

The Likely Culprit: Dry Air and Hitchhikers

Turning on the heat creates a dry environment that pests like spider mites adore. They thrive when humidity is low. Other pests may have hitched a ride indoors on plants that spent the summer outside. Fungus gnats (those annoying little flies) are a sign of soil that's staying too moist-another symptom of overwatering.

The Fix: Inspect your plants regularly, especially the undersides of leaves. Increase humidity by grouping plants, using a humidifier, or placing pots on pebble trays. For plants that came indoors, a preventative treatment with insecticidal soap is a wise move.

For humidity fundamentals, see Care: Humidity.

The Likely Culprit: Low Humidity

The moment your central heating comes on, it starts stripping moisture from the air. For plants that evolved in humid rainforests, this dry air is torture, and it causes the delicate edges of their leaves to dry out and turn brown and crispy.

The Fix: This is all about boosting ambient moisture. A humidifier is the most effective tool. Grouping your humidity-loving plants together can also create a beneficial microclimate. Read more in our guide to brown, crispy edges.

Is it normal for my plant to lose a few leaves in the fall?

Yes, it's completely normal for a plant to shed a few of its oldest, lowest leaves as it prepares for winter dormancy. This conserves energy. However, widespread or sudden leaf loss is a sign of a problem.

How can I tell if my yellow leaves are from overwatering or something else?

Check the soil. If the soil is consistently damp and the yellowing leaves are soft or mushy, overwatering is the likely cause. If the soil is dry and the leaves are crispy, it could be underwatering or low humidity.

Why do I suddenly have gnats flying around my plants?

Those are likely fungus gnats, which thrive in consistently moist soil. Their appearance in autumn is a strong indicator that you are overwatering your plants as their growth has slowed down.

My Fiddle Leaf Fig dropped three leaves overnight! What happened?

Fiddle Leaf Figs are famous for dropping leaves when they experience a sudden change. This is most likely due to a cold draft from a nearby window or a blast of hot air from a heating vent that just turned on for the season.