I have Mulch that has been down for approx. 1 year and would like to put down crushed brick. My question is: Is it okay to put the crushed brick on top of the mulch or should the mulch be removed first?
I'd suggest removing the organic mulch first. (Perhaps you can use it somewhere else in the landscape.) By placing the crushed brick directly on top of other mulch, they may tend to mix over time, which would destroy the uniform appearance of the brick mulch.