Originally Posted by greendoctor
To add, if mowing and irrigation are not correct, it is impossible to control weeds here. Keeping lawns on preemergent herbicides 12 months straight and constantly applying postemergents eventually damages the lawn. I have seen it happen to other lawn people. They have managed to OD the lawn on many herbicides, kind of like when a person is on 30 different medications. When the actual fix was to correct irrigation and fertilize properly.
We almost have to keep them on some Pre-emergents year round in Texas because there are so many weeds. I do like to spot treat weeds after I get the lawn under control. Some lawns you just pull a handfull of the weeds.
Ultimately the goal is less reliance on weed control and more on good maintenance. I love the adjuntives to build up the turf. It takes about two seasons to see the real results but really bad yards will look improved in 4 to 6 months depending on the expectations.