When making herbicide treatments this spring keep the following information in mind. Making a herbicide application too soon after a frost will most likely reduce its effectiveness. Herbicide movement within plants is slowed after cooler day and night temperatures and cloudy days. It is best to wait a few days for warmer temperatures and see how the plant responds after the frost. The plant needs to have at least 60 percent viable, healthy tissue to take in the herbicide. Therefore, evaluate the plants you are looking at treating and make the decision based on visual signs. When treating plants around frost times, plan on using the maximum rate of product as allowed by the label along with a high-quality surfactant to achieve adequate control results. For more information on herbicides and plants, go to www.weldweeds.org.