By Loosestrife2
United States 
What would be an adequate depth of decorative mulch(colored wood chips) to significantly inhibit weed growth? I will have dahlias, oriental lillies, hyssop, hosta..etc punching their way through the mulch next spring. Thank You
13 Nov, 2015
Answers
3-4 inches as a bare minimum. if money no object then 4-6 is better still. membrane would be a problem if you didnt cut holes in the right place for your emergent plants.
13 Nov, 2015
You might find it helpful to lay down some sort of barrier first, then 3-4 inches of mulch on top. Landscape fabric, cardboard or thick layers of newspaper work well for me - for a while anyway.
13 Nov, 2015