After it's flowered it'll start putting out long shoots which root where they touch down. They're the ones to cut off if you don't want more of it. Or peg them down where you do want it. It's useful for dry shade.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Posts
https://www.wildlifetrusts.org/wildlife-explorer/wildflowers/yellow-archangel
A bit of a spreader but good ground cover in difficult places and under trees etc.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.