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You should see results after about 3 days on the dandelions. They should start to wilt and sometimes turn black after 5-7 days. The flowers then stay closed up during the day and do not open. After 2 weeks most of mine are gone. It is important to remember that weed and feed mostly kills the weeds which are already present, and does not do a good job of prevention.

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Q: How long does it take for Lesco 18 0 9 weed and feed to kill weeds?
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