Is It Ok To Put Down Pine Bark Mulch Right Over Pre-existing Rock Mulch To Freshen The Look?

Question

The rocks are little red rocks (maybe volcanic rock) that have been down for over 30 yrs.

Answer 1

Yes, you can, but remember, the bark mulch will decompose over time and the rock mulch will show through. You could rake off the rock mulch if you want the benefits of bark mulch. Here is more:

https://www.gardeningknowhow.com/garden-how-to/mulch/choosing-garden-mulch.htm