Black Spot On New Monstera Leaf. The most common cause of a Monstera having brown spots on its leaves is leaf spot disease caused by overwatering or poorly draining soil. Bacterial and fungal infections on Monstera tend to take the form of brown to black spots with a yellow halo around them.
Well-meaning plant parents can love their plants a bit too much by over watering which causes root rot. As a soil-borne fungus its present at all times even deep winter. How to Treat Root Rot in Monsteras.
These dead tissue spots can spread really quickly.
The most common cause of a Monstera having brown spots on its leaves is leaf spot disease caused by overwatering or poorly draining soil. Spots appear on the leaf plates if the container with the flower is in a draft. Prune off all leaves that have any spots as soon as you notice them. If you notice dark brown spots on your monstera leaves this might indicate that your plants roots are rotting due to over-watering.
