Originally Posted by Duekster
Speed zone southern? St Augustine grass is killed by Speed Zone
Speed zone southern is a 3 way herbicide that has had a St Augustine Label until some one in the Tampa area over applied it in hot weather. As result Gordon's took St A. off the label as a tolerant turf. It is still labeled for turf and therefore both legal and effective weed killer on St Augustine if applied correctly.
BTW there are still a few non name brand 3 way herbicides with St A. still on the label.