How do I get rid of grass in my mulch bed?
Can I put grass killer on mulch?
Use Pre-emergent herbicides
As detailed above, pre-emergent herbicides kill weeds before they sprout. They work best when you apply them on the soil with a spray can then apply the mulch. If the weeds have already sprouted, you can apply this type of herbicides by first uprooting the weeds.
How do you kill grass in a landscape bed?
How do I stop grass from creeping in my flower beds?
Preventing Grass in Flower Beds
One good strategy for prevention is to use a barrier between beds and the lawn. Landscaping bricks or plastic barriers that you sink a few inches into the ground can really help keep grass at bay. Keep an eye on the edges and pull any grass you see creeping its way into the bed.