Lovely post! I also love mallows, yours I would call Marsh Mallows but I don't remember quite where I got that name. They come up every year in my garden, but never ever in the same spot. I have to keep an eye out for them when I am weeding so I don't yank them right out before they've had a chance to do their sweet thing. Sure wish I could take such lovely photos!
Thanks @oswasco! The mallows like to move around. They make such a nice display of color. I used to have white ones but now only the pink color.