Hey there!! I’ve had this monstera for approx 6 weeks, and it was doing well until I noticed the tips of some of the established leaves turning brown at the end. Then over time I noticed others had brown crunchy spots in the middle, until finally I noticed that even leaves that had not unfurled yet had started to turn brown and yellow as well. I let the soil dry before watering, and mist on occasion. The plant is in a south facing window with the blinds slightly drawn to prevent sunburn, which I thought was causing the issue but now I’m not so sure. Any advice is welcome, thank you all!
Certified GKH Gardening Expert
This is, likely, a fungal infection. This can happen just because the soil was infected upon purchase, or it may have sit in a moist environment for too long before planting. Sometimes just one time being watered too much is all it takes.
This can be cured with wettable sulfur and dolomitic lime since it is not too far advanced. They will also appreciate as much sun as you can give them. It will likely want even more than a modern filtered window will have to offer in direct light. You will be safe to open them up to let more light in.
This article will give you more information on the care of these: https://www.gardeningknowhow.com/houseplants/swiss-cheese-plant/proper-care-of-a-swiss-cheese-plant-swiss-cheese-plant-propagation.htm