That trough gets full sun in the morning and a bit of shade later in the day due to the tree and plantings along the driveway, but full sun would be preferable! Draba and other alpine plants are typically adapted to full sun, given that they occur naturally above tree line. (In hotter conditions at lower elevations, some alpines appreciate some shade but Draba are not among those more delicate ones.) Perhaps I shouldn't repeat it here but you can read about our troughs in the Rock Gardening thread about other ways to grow alpines. (To summarize, they don't get or particularly need winter protection.)
