why? We have a lot of buttercups on the farm its not an issue. Also spraying isn't great for the soils plus costs to worry about something that's not necessary.
I'm looking at trying to reduce ours because they spread out, kill grass off, bad for animals. Even the goats have sense not to eat them.
I wouldn't mind small areas, but when you are looking at many square yards it needs dealing with.
So I'm with pigalicious.
Your nitro rich fertilizer may help grass swamp out the buttercups, or feed the buttercups? ?
There are weedkiller for broadleaved weeds, but I still try to spot spray, whether the dreaded glyphosate or selective.