Herbicides Herbicides can provide good weed control in established plantings. It is unwise to use herbicides until blueberry plants have become established in the field for 6 months to 1 year. Herbicides will provide selective control of many annual and perennial weeds. For current suggestions, consult with your county Extension office. Special care in calibration of herbicide application equipment is essential in blueberries.
Plant roots are very shallow and easily damaged by excessive rates of certain herbicides.
Poor application of herbicides may lead to blueberry plant injury. Higher labeled rates of some herbicides may be necessary because blueberries are typically grown in soil with high organic matter content. Herbicides have a tendency to be adsorbed, or become attached tightly, to soil particles or organic matter in soil, thus rendering them less active. This fact sheet is adapted from Oregon State University Extension Publication PNW215, Highbush Blueberry Production .