Roundup is one of the more popular brands of herbicide. It is a post-emergent herbicide, used for controlling existing weeds. Roundup can save gardeners a lot of time and energy, but must be used properly. Avoid spraying it in windy conditions. Even a small amount of Roundup blown onto a plant can kill it.
How It Works
Roundup works by inhibiting an enzyme called EPSP synthase. This enzyme is necessary for the plant to produce proteins needed for plant growth. Therefore, once the plant has been sprayed, its leaves turn yellow, and the plant dies over a period of a week or two.
Once Roundup has dried, it is no longer a threat to other plants. However, waiting a week after spraying to plant your garden is a good idea. If you plan to till the soil before planting, till first, spray Roundup second.
Weed control fabric is a wise choice for your garden. It allows moisture and oxygen to pass through, but prevents weeds from growing. After spraying Roundup and allowing it to dry, lay down the fabric. Cut holes in the fabric wherever your plants will go, and insert the plants.
Post-emergent Weed Control
Roundup is a post-emergent weed killer. It is sprayed on the weeds after they have appeared in your garden. It must contact the plant in order to do its job.
Pre-emergent Weed Control
A pre-emergent weed killer stops weeds from growing, before they have even appeared. A pre-emergent weed killer is most often used on established lawns in the spring, and again in the fall. These are the two times of the year when weed growth is most prevalent.