Fir hemlock spruce bark sized 2″ to 3″
The medium spruce bark are ideally used for decorative ground cover to control weeds, retain moisture and beautify an area.
Spruce barck should be installed 4-5” inches thick except right at the plant. There you would go up to the plant and may only have 2” thick.
So as not to disturb the root system it is best to use a heavy duty landscape fabric.
Fabric will let water through and reduce weed growth.
Note: After installing all mulches, be sure to water well.