Any houseplants people can tell me what's going on with (336 views)

My neighbor is moving and asked me if I want some plants since she is moving to the UK.

One of them is a monstera. I never seen this leaf/stem issue before. I snapped a pictures of her plant since I was curious. Two of the leaves (the lighter ones so newer) have black spots/marks on the leaves. The other leaves look good. The yellowish green leaves are not small (not as big as the green ones so perhaps newer). Any idea?

Thanks!