1 Mechanical digestion is evident, where one can see the breaking down of large food particles into smaller ones after being ground by the teeth. 2  While the chemical changes that take place happen within the body and are not visible.
Using a pre-emergent herbicide around your property could stop these territorial plants from overtaking your home's most valued green space. Pre-emergent herbicide is a type of weed killer that prevents weed seeds from sprouting. Unlike normal herbicide, it is meant to stop weeds from growing in the first place by spraying or spreading a chemical onto the soil so that weeds have difficulty placing down their roots.
Pre-emergent applications put down a microscopic layer on the soil that prevents many seeds from sprouting, including crabgrass. This invisible shield is usually put down in early spring before the soil temperature reaches 55-60 degrees. No. The pre-emergent will also stop desired grass from growing also. It is generally better to wait until the fall to plant new grass seed after a pre-emergent application has been put down. However, there are some special situations that we can help you with. Please call our office to discuss your situation.