We have great moss growing between and on the bricks on a patio on the north side of our house. It always seems to do well. This fall I slipped on what I thought was mud, but actually appears to be rotting moss - it's like a dark brown, slippery, slime:
It has been happening for the past few weeks, starting before the leaves on the trees started to fall.
Any idea what's going on?
It looks like slime mould and I'm pretty sure it is - it's possible for this to grow over and in moss if the area has been pretty wet for a while, the same way it can on lawns. You could try blasting the affected areas with a high pressure hose, or at least with the tap turned on full. If that doesn't work, what will work is mosskiller - which of course you don't want to use because it'll kill the moss too. On the other hand, it's pretty dangerous and slippy as it is. If you can bear to leave it, it should just pass.
