Academia wrote:

If you use fertilizer containing weed killer they want you to put it on wet
grass and do not wash it off the grass.

But if you use fertilizer without weed killer they want it washed off of the
grass. Why? Is this fertilizer different chemically?

Thanks

'weed & feed' is a contradiction.

herbicides need to stay in contact with the plant they are
intended to kill long enough for the plant to absorb the
chemical doing the killing.

fertilizers of the granular type need to go on the ground
so they can be absorbed into the soil and made available
to the root systems they are intended to feed.

most types of granular nitrogen in contact with plant
foliage do more harm than good.


products known as 'weed & feed' were invented as some kind of
great time saver and are mostly used by the unfortunate unknowing
unaware types of people looking for a quick solution with the
least amount of time away from their beer and watching their
sports-guy heroes on video.