A couple of years ago I began to see wild, large buttercups growing in my "wild" garden by a stream. I thought they were sweet, so I left them. Last summer I was appalled to discover that they have totally infested that garden and had jumped over to my more formal garden! I'm so upset and from what I read, it's nearly impossible to get rid of them. HELP!!
This article will help you.
https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-buttercup-weeds.htm
Unfortunately, your photos did not come through. I am unable to assess the damage. In the meantime, Here is a collection of article that will help you with their care:
https://www.gardeningknowhow.com/ornamental/bulbs/ranunculus