rvs007 wrote: ↑May 29th, 2018 2:07 pmJust going by the instructions on my jug of Bonide Weedbeater which says to mow before treating for best results.
Best Answer.craftsman wrote: ↑May 29th, 2018 2:07 pmThe answer is a bit more complicated than the question....
For weed killer to work, the active ingredient (I'm assuming we are talking about 2,4-D) would need to contact the leaves of the weed in sufficient quantities to actually kill the weed. If you mow the grass first, some weeds will have most of their leaves mowed with the grass so there will be a very small target area to hit. On the other hand, other weeds which are more hug the ground type of weed, will be more exposed making them easier to target with the weed killer. For best results, depending on the assortment of weeds, maybe to do two applications, once after mowing to hit the ground hugging weeds like the creeping charlies and one in a few weeks after for those who hand most of their leaves mowed off and started to grow back.