By Aldermans
United Kingdom 
I have three grass plants (look like cortaderia) but not sure, they are now turning into clumps of soil with the grasses growing out of them. Why is this
6 Mar, 2011
Answers
Sounds like ants to me. If its crumbly soil then it could well be. Just remove it and you will soon see as there will be ants and their eggs amongst it.
6 Mar, 2011
Well presumably the soil's banked up around the crown, that's all.
If you want to move it away just brush it away with your hand or a trowel.
6 Mar, 2011