posted 1 year ago
If you can continue adding debris to the mound, along with yearly or seasonally sowing seeds of certain "mat" type ground cover, that might help to keep the desired structure of the mound. White clover is pretty amazing at this, but I'm unsure about your particular situation as I don't have any long term experience with a hugelmound.
Several years ago I expiremented with building and maintaining a mound at another location and found that lots of small twigs mixed into the mulch (which consisted mostly of leaves and grass clippings) did ok to keep it a "mound" - This was due to not having enough soil on it and animals like chipmunks creating gaping holes in and thru it.
Heres to hoping that the worms you have actually HELP the mound in someway alongside with your intuitive/trial and error management! :)