I planted a bermuda lawn by hydro-mulch in July 2005 in Fort Worth. The instructions that came with the hydro-mulch warned against using any weed killer for one year. Unfortunately the lawn has spots of crabgrass. Is it OK to use crabgrass preventer on this 10 month old lawn? How about using broad-leaf weed killer as well? Overall, the lawn seems healthy and is starting to green up already thanks to the warm winter. Thanks for the help.