Mulch shouldn't be more than 3 to 4" deep, and needs to be "top dressed" each year since mulch will work its way into the soil - about half of the height every season. Make sure you keep the mulch at least 1" away from all of your plant stems so they can breathe and have a chance to dry out after they are watered so they don't develop mold.
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1" to 4" depending on the type of mulch and the plants in your bed. These sites will explain in further detail.
http://www.gomulch.com/index.cfm/name-res.askanexpert/app_qid-28
http://homeguides.sfgate.com/thick-should-mulch-planting-bed-33045.html
Mulch shouldn't be more than 3 to 4" deep, and needs to be "top dressed" each year since mulch will work its way into the soil - about half of the height every season. Make sure you keep the mulch at least 1" away from all of your plant stems so they can breathe and have a chance to dry out after they are watered so they don't develop mold.
4" thick
Most likely 3 to 4 inches.
I agree with above comments. Anywhere between 3 and 4 inches works great.