Do I need to put something down before laying rock mulch to suppress weed growth?

Question

Thank you.

Answer 1

Yes or be prepared to use herbicide weed killer.

If its only rock ground cover in the area then you can use plastic. But if you have plants among the rock that need watering you should consider a landscape weed control fabric.

https://www.gardeningknowhow.com/plant-problems/weeds/weed-barriers-in-gardens.htm