What's wrong with my schefflera?
Hi, a couple of months ago the top of my schefflera suddenly went black, and during the following weeks some kind of lump grew out of it. It's hard, dry, and smells a bit like resin from a tree. Does anyone know what this is? Do I need to cut it back? Although you can see some brownish spots on the stem, the leaves look healthy - there just hasn't been any more growth since this thing appeared (it's a young plant, just 40 cm tall).