I have a big broadleaf problem in my yard. I bought some Gordon's LV 400 2-4d to take care of the broadleafs and alfalfa in my yard. Is this sufficient? Also, I just got done mowing the yard, and was about to spray with my 20 gallon pull behind, but after doing some reading a lot of people are saying I should wait a few days after mowing then spray, so that the weeds have more coverage to take in the chemicals? Thanks!