For a weed killer in a liriope bed, you need to be very careful. Most general liquid weed killers (like glyphosate or broad-spectrum herbicides) will damage or kill liriope along with the weeds, because they don’t distinguish between ornamental plants and unwanted growth. In short: No, you should not use a general 24 oz amber liquid weed killer directly on weeds in a liriope bed unless the product label specifically lists liriope as tolerant. Otherwise, it will likely damage your plants.