Best to kill with roundup, it kills the root. If you pull there will be roots that remain to grow again. If you want to pull wait for a week after spraying.
I use extended preen twice a year, good for 6 mos. My big problem is crabgrass that grows in the bushes. HD suggested a spray to attach to hose, but directions say not to use in 90 heat so i 'll have to wait. Preen will not kill crabgrass, but HD gave me a granular crabgrass preventer to spread in the early spring. We'll see how that goes.
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