Our program uses two different classes of herbicides to control a broad range of weeds--pre-emergent and post-emergent. Pre-emergent weed control is applied before seeds have a chance to germinate. This type of herbicide will not usually control weeds that are already visible. Pre-emergent weed control is applied in the early Spring to prevent germination of crabgrass and goosegrass and applied in the Fall to prevent the germination of annual bluegrass and henbit.
Post-emergent weed control can be applied with any treatment when temperatures are below 90 degrees F. Post-emergent weed control will control broadleaf weeds such as clover, dollar weed, dandelion, plantains, spurge, and other susceptible weeds.
Weed control takes time. It is necessary to break the life cycle of the weeds in order to control them. Thousands of seeds are left in the turf even after the parent plant has died. These seeds can still germinate years after they were produced. For this reason, it is not uncommon to have as many weeds or more from one year to the next. Only through proper fertilization and continued weed control can the life cycle be broken and weed "control" be acheived. This process usually takes one to two years and possibly even longer under adverse conditions. Some weeds are not susceptibel to any of the herbicides which can be used on local grasses, and for this reason, we cannot chemically control those certain types of weeds.