I think a "jungle of flowers" is what's best for butterflies. I mean, you probably have to plan somewhat to get your host plants in there. But as far as nectar plants go, I'm always telling people to just leave a weedy patch if they can. I see so many butterflies in the medians of roads and on the side of the interstate! You know, until they mow it.
But they've been doing less of that to cut costs and also to increase the wildflowers on the side of the road. We're slowly learning, I think.
Also, I'm totally jealous over just the thought of a meadow by the River Shannon. Doesn't that sound delightful? Yeah, I'm an American who has never been out of the country. Granted, ours is rather large.
I know they say, "The grass is always greener on the other side of the pond", or something like that, but I think in Ireland it's true. They call it the Emerald Isle for a reason, right? Plus, I watch "Game of Thrones" and they film parts of the show there and it looks incredible! I bet the butterflies there are so happy.