If it is a grass, you should pull it out, careful to disturb as little as possible the vegetable plant. We've never used herbicides or pesticides in the garden - please do not start without conversing with others.
Public Enemy #1 = Bermudagrass! You have to dig deep to get all the root because it spreads by rhisome. #2 Nutsedge Easy to pull but if you don't get that nut on the root, it will grow back. #3 Dallisgrass #4 Crabgrass and other invasive grasses. Sedges have edges; rushes are round; grasses are hollow right up from the ground. Another version of this poem is, Sedges have edges, rushes are round, grasses have nodes and willows abound.