The Q&A Archives: Killing Dandelions

Question: How to rid lawn of dandelions?

Answer: The most effective herbicide for killing dandelions is 2,4-D. You'll probably find it mixed with other broad- leaved weed-killers such as MCPP (Mecoprop) and dicamba.
If you choose to use an herbicide, the best time to apply it is usually in May. Temperatures should be in the 60s or 70s, wind should be calm, and there should be no rain forecast for at least 24 hours; preferably 48 hours. It is much easier to damage non-target plants in spring than fall, because tender young leaves are much more sensitive to spray drift than tougher, older leaves. Hold your sparayer close to the ground, and spray only those parts of the lawn that need it. As always, be sure to READ THE LABEL CAREFULLY AND FOLLOW ITS DIRECTIONS EACH AND EVERY TIME YOU USE THE HERBICIDE.

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