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The best way to prevent weeds is to use polymeric sand, which hardens and blocks weed growth when activated with water. If you're using regular sand, you'll need to refill and compact it more often. Keeping the surface clean and free of debris can also help prevent weed seeds from settling in the joints.

Buffalo grass is not a dense grass, so weeds can grow between the buffalo grass plants. However, as long as you don’t overwater your lawn, weeds have a hard time growing. If you do notice weeds, you can use granular herbicides that are safe for buffalo grass in early and late summer.

Water the lawn thoroughly, apply fertilizer, and overseed if necessary to promote healthy growth.

Some of the particular herbicides that work best to get rid of nut grass without killing the grass include Halosulfuron-methyl, mesotrione, sulfentrazone, and metsulfuron. A herbicide like glyphosate would kill nutgrass, but it will kill nearby plants, too.