You know how people give a christmass tree sprite or 7 up and it keeps the thing more lively for another week or 2...
You think that would do anything with weed. lol.
That is a thing with christmas trees... If you put (sprite I think it is) in the base thingy instead of water. It stays green longer and the needles stay on there better.
There may be a benefit. Sugar increases microbial activity in soil. It can also lower the pH.
This question reminded me of adding molasses to soil. There's plenty of information about using it. Tomato growers especially like to use it because, in addition to helping the soil, it sweetens the taste of the tomatoes. It might affect the taste of weed, too, as far as I know.
There are plenty of search results about adding molasses.