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I have been using BLI for over 2 years for all of my landscape needs.They have extensive knowledge...
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Pre-emergent is a weed control that prevents weed germination. It is applied to areas before weeds start to grow. The effect of pre-emergent is a prevention, not a controller of existing weeds. A pre-emergent program allows a layer to chemicals to stop weed growth. Although pre-emergent is very effective, it does not prevent 100% of weed germination. It is still applied to an external environment, which can not be controlled from all angles.