Landscape fabric is used for weed control, a central element in achieving low-maintenance landscaping. 
You don't feel like pulling creeping charlie (picture) out of a planting bed when you could be admiring your flowers instead, do you? Effective weed control means a reduction in weeding or in herbicide use -- both unsavory landscaping tasks. But it's important to learn how to lay landscape fabric properly. This article shows you how, using pictures.
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Comments
As a professional Landscaper, I thank you for showing how to use a weed barrier properly. Having to remove an improperly installed one after plants have matured is time consuming.