I'd love to hear the answers too, Kurt! Butterflies don't puddle here too much; I think it's because our soil is so bad. I know they get salts and minerals out of the soil, but I don't know if you'd actually need to amend it. I suppose if you started with playground sand you might need to. I've seen a lot of Swallowtails puddling when I visit WV. I always take lots of pictures because I see it so rarely.
