Pelargonium endlicherianum

Turkish Pelargonium. Hardy to Zone 5, possibly colder. Full sun and perfect drainage (otherwise they'll rot) are necessary in Cheyenne. My most reliable germination has been via wintersowing. Unfortunately, the vivid-pink blooms with darker-pink veining are so eye-catching that they may become something of an attractive nuisance (and people may try to remove them from your yard -- guess why I know this).