Be careful with snow-in-summer, it's a thug and will swamp other things given half a chance. I have it in the base of a privet hedge where nothing much else will grow, and even there it needs some hoiking out every now and again.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Euphorbia diamond frost - annual but lovely.
Platycodon grandifora - white variety. Perennial.