Spring Dandelion Control for Professionals – Turfgrass Science at Purdue University

Spring Dandelion Control for Professionals

Many turf areas did not get treated for broadleaf weeds last fall because of the dry weather. Though fall applications are most effective for controlling broadleaf weeds, spring applications are warranted for new lawns or areas that did not get treated last fall. Spring applications will be most effective if you wait until dandelions are flowering or at the puffball stage (but still not as effective as fall applications). Applications before mid-April will only “burn” the leaves and weeds will grow back by summer. Though control improves later in the spring, unfortunately so does the chance of off-site target damage to ornamentals, gardens, etc. Amines tend to be less volatile than esters thus reducing the chances for off-target damage later in the spring. To further increase efficacy, apply so the product will dry on the leaf for 24 hours or more before a rain, do not mow immediately prior to application to maximize leaf area, and do not mow for three days following application to allow the products to translocate.

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