Unfortunately, you have to do it all manually. I understand that this is not the most pleasant experience, but you have no other choice. I was also constantly annoyed to do this, especially when you have a large field. It takes me on average up to half an hour ... *content removed*
I would be happy if someone could share advice on how to speed up weed control. Perhaps someone has already come up with an automatic way to do this? I would love any advice!
I don't have a way to make weeding any easier, but if you want to prevent them from showing up in the first place, you can use a transparent pattern to cover almost all your town. Keep in mind that you still need space for fossils to show up.
I know this is a long shot, but...
If anyone is interested in hosting a virtual Pampered Chef party, PT me!