adding soil to beds with tree mulch
Hi: I have flower beds that likely have very old soil in them. I want to mix in new triple mix but there is tree mulch on the beds. Can I mix the mulch in with the new soil? Or do I have to remove the mulch (tricky, I suspect) and then add soil and then put mulch back? Is it bad to mix them together and then add a fresh layer of mulch when beds are topped up? Thank you for your help!