I've been doing 6 rounds per year for probably years and it seems to have worked fine. I've noticed a lot of companies lately have bumped up to 8 or sometimes more which in the past I considered more marketing than good for the customer. This year in Dallas we had HUGE amounts of rain which made everything grow great - lawns, broadleaf weeds and especially grassy weeds. I've had to make 4 or 5 free re-treat trips to a lot of houses which makes me think maybe I should stick in an extra round in early summer. Any thoughts?