Preemergent herbicides are chemicals that prevent the germinating weeds from establishing in the lawn or flower beds unlike post emergent herbicides. These herbicides control annual grass weeds by inhibiting cell division in the young root system. The failure of the root system to develop results in the death of the young seedling weed shortly after germination.
We are told over and over again that a thick healthy lawn will grow no weeds and that is true for the most part, but we all struggle with certain areas that are thin or suffering. So for homeowners who cannot satisfactorily address the control of annual grass weeds in a preventive manner using only cultural controls, the best way to stop annual grass weeds from establishing in their lawns is through the use of preemergent herbicides.
At evegetationmanager we offer a complete line of commercial pre-emergent herbicides for use in residential, commercial, and recreational turf grasses. In addition we carry herbicides for preventing undesired weeds from establishing in landscape and ornamental and flower bed areas. Pre-emergent herbicides can be an excellent tool for preventing weeds from becoming established and spreading.
Pre-emergent herbicides can be purchased in easy to apply liquid and granular forms and are typically applied 2 to 3 times per year, depending on temperature and rain fall.
Evegetationmanager featured pre-emergent herbicides include Pendulum with Pendimethalin, Dimension with Dithyopyr, and Simazine.
Lawns with thin stands of grass that do not provide 100 percent cover may require yearly applications of a preemergent herbicide to prevent the invasion of crabgrass and other annual grass weeds.
Application times for most areas are March and September.
Pre-emergent herbicide is used early in the growing season and prevents seeds from germinating as the weather becomes warmer in the spring. The herbicide creates a barrier and seal around the seed, making it impossible for the seed to sprout and a new plant to grow.
Aerating or turning the soil in anyway will destroy the pre-emergent barrier, so do everything you need to get done before you put your preemergent out. I like to mulch on top of the pre-emergent as an added layer of protection.
Pre-emergent herbicides are available in a 2 different forms, liquid, and granular. I prefer the granular type because application is very easy and can be done very quickly with a drop spreader or hand held device.