Herbicides can damage any type of plant and injury usually happens as a result of drift, careless application or evaporation during hot weather. Symptoms of herbicide injury may include: twisted plant stems; stem fasciation; narrow, curling or leathery leaves; or excessive callus formation on roots and stems along with secondary root growth. At extremely low application rates, broadleaf herbicides such as 2,4-D, MCPP or dicamba usually will not kill plants, although they will act as growth regulators.
Use extreme care when applying broadleaf herbicides. Don't apply on windy days or during hot weather. Keep spray nozzle heads close to the ground and aim directly at target weeds. Spray under low pressure to minimize fine droplets. Use the 'amine' form of the compound rather than the 'ester' to avoid evaporation (volatilization). Always apply herbicides according to label directions. If your plants have already sustained herbicide damage, there is nothing you can do. Young growth will be distorted and discolored, but subsequent growth will be normal.
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