You could try putting down some seed next year... but the preemergent stuff works on grass seed too, so you can't seed a lawn that has been applied with it. Something to remember for next year.
Honestly, if the weeds are really that bad, you might consider a mechanical means to remove them. Cover them with black plastic and let them cook for a few weeks, then plant grass on top of them once they've rotted.
killing weeds and grass in my vegetable garden
the grass and weeds have taken over my garden what is the best way to kill them
If they're actually in your garden bed you have a problem. There aren't any selective herbacides to work on a veggie or flower garden.
There is a product called preen that will stop weed & grass seeds from germinating that you can use in such a garden, but only if you don't need veggie or flower seeds to germinate as they will be stopped too.
To get rid of existing ones, you really have to go full out in killing them.
Completely cover the garden with black plastic, cardboard, or newspaper, or a thick landscape fabric (that sunlight cannot get through), for 1 month to 6 weeks. It will kill everything in there. It is important that you do not leave any gaps for light to get through. You will have nice rich soil at the end of this as well. This is really the only way to repair a neglected garden, many of the grassy weeds will come back if you merely try to pull them out.
If you like, you can try just pulling out the weeds nearest to your plants, and then putting the plastic/etc up to the base of your plants. It is more work but you can keep your plants. If you do this route I recommend cardboard, 2 layers thick, and then putting bark mulch on top of the cardboard, the cardboard will decompose, improving the soil, so you do not need to take it off after a month.
The next step is prevention to make sure it doesn't happen again. Put some kind of border between your bed and your lawn or wherever it is. If you put something 4-6 inches into the ground grass cannot send runners under it. Then make sure your bed always has ample mulch on it, 2 inches or so, and weed regularly while the weeds are small and easy to get rid of.
I've also used wood chips with some success of keeping the weeds at bay.
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I'm a tree hugger, so I don't use herbicides or weed killers. I find that the weeds only come up where there is no grass or the grass is getting thin. The best solution for me is to keep my yard well seeded and my grass healthy. It wards off weeds before they start.
I do have trouble with dandelions around my gravel driveway. The gravel kills the grass and the weeds pop up around the edge of the driveway every spring. UGH. I've been struggling with the idea of spraying them with round up, but I just won't do it.
Honestly we need to do this but I am afraid that if I kill the weeds we will have nothing in our yard green. We have one sections that to me I feel is mostly weeds.
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