Swingos from Northern Kentucky writes
What about application to Bermuda grass that is still dormant after the winter? Rosemary
Barricade is a pre-emergence herbicide that controls susceptible weeds by preventing growth and development of newly germinated weeds. It does not kill actively growing weeds. It can be safely applied to dormant or non dormant Bermudagrass. Application timing will vary by region and the best person to ask about application timing is your local master gardener who works at your local cooperative extension office
Answer last updated on: 06/23/2014