Why don't all my weeds die?

Weed control often can be a chore. Establishing weed barriers by pre-emergent can take several years. Applying pre-emergent over a period of years can cause a weed barrier to develop, one that stops weed seeds from germinating and this can take time. Stubborn weeds like, crabgrass, dallisgrass, Poa annua (annual wild bluegrass) are best controled when temperatures are above 80 degrees. Mild temperatures can inhibit control and cause weeds to fluorish, however, weeds like henbit, dandilions and clover can be controled relatively easy this time of year depending on rainfall. Overall, effective weed control can be plaqued by many factors outside of the control of your lawncare company, i.e., mowing schedule, rainfall, temperature and time of year. Look for the link on this page for weed control explanation.