Hi, Well you can use a product called PREEN which is a pre-emergent herbicide so it will prevent any weed seeds from sprouting in your mulch. I would not spray near your bushes. Hand weeding may still be necessary, but if you can spray without hitting your shrubs, I'd suggest Round-up on any weeds that sprout. Round-up only works on living weeds, it will not keep weeds from sprouting like the PREEN does.
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