Bayer Advanced Season Long Weed Control for Lawns RTS is indeed labaled to control black medic when used as directed on the product label.
Bio Advanced Season Long Weed Control for Lawns RTS can be applied in the spring through fall when temperatures are between 50-90 degrees and the targeted weeds are actively growing for best results as directed.
Bayer Advanced Season Long Weed Control for Lawns RTS is labeled to kill and prevent Oxalis. The product label states that it may be used on "St. Augustinegrass (not for use on improved varieties of St. Augustinegrass, such as Floratam)." Please be sure to review the product label for more information and complete application instructions.