Most swiss cheese plant problems trace back to just two things: light and water. The four issues you will run into most are yellow leaves, leaves with no holes, brown crispy edges, and root rot. Get the light and the watering right and nearly all of them clear up on their own. Once you learn to read the symptoms, you can fix your plant before it loses much growth.
Yellowing is the warning sign you will see first. When the lower leaves turn yellow and the soil feels soggy, you are watering too much. Those yellow monstera leaves show that the roots sit in water and cannot pull in oxygen. So the plant drops its oldest growth to save energy. Stop watering and let the soil dry out. Once the top dries between waterings, your new leaves come in green and firm.
Soggy soil that never dries leads straight to the worst issue of all. Monstera root rot is the top cause of a plant going into real decline, and it starts when the roots stay wet for days. Healthy roots are firm and pale. Rotten ones turn brown, mushy, and smell sour when you slide the plant out of its pot. The longer the roots sit in water, the more of them you lose, so you want to catch this early. A pot with drainage holes and a chunky mix with bark or perlite gives the water somewhere to go and keeps the roots breathing.
Slide the plant out and feel the roots. Firm and white is healthy. Brown, soft, or smelly means you need to trim off the rot, repot in fresh dry mix, and water far less from now on.
Brown, crispy edges are a different problem with a different fix. Dry, papery leaf tips point to low humidity, not bad watering. These plants come from humid jungle floors. They struggle when your indoor air drops below 40%, which happens fast in winter when the heat runs. Raise the humidity above 50% with a humidifier or a tray of water set near the pot. Your new leaves will then stay soft and whole instead of browning at the edges.
The classic letdown is a plant whose leaves stay solid with no holes at all. Too little light is the usual cause. A young plant also makes solid leaves until it matures, so age can play a part too. The holes are called fenestrations, and they only form once the plant gets enough bright, indirect light to build big leaves. Move your plant closer to a bright window. The next few leaves it pushes out should start to split.
You also want to watch the underside of the leaves for pests. Thrips are the most common bug these plants get, and they leave silvery streaks and tiny black specks behind. Wipe the leaves down with a damp cloth and treat with insecticidal soap if you spot them. Check the new growth often, since that is where they like to feed. Catch them early and you can clear them before they spread to your other plants.
One sign that looks scary is in fact normal. Small water drops on the leaf tips in the morning are called guttation. The plant simply pushes out extra moisture overnight. This is not a disease and it needs no fix at all, so you can leave it be. To handle the real swiss cheese plant problems, work through them in a clear order. Let the top 1-2 inches (2.5-5 cm) of soil dry between waterings. Keep the humidity above 50%. Then give your plant bright light to bring back those signature holes.
Read the full article: Swiss Cheese Plant Care: A Full Guide
