If you're looking for an easy-to-please shade-loving perennial that flowers its head off in spring, Primula sieboldii is hard to beat. It comes in many forms, all of which spread into good-sized clumps that send up rounded clusters of large flowers that range in color from white to pink to purple to blue. This outstanding white-flowered form is grown from seed from the famed Barnhaven primrose nursery in France. All forms of the species go dormant in summer. Zone 4. Propagated from seed. Deep 3.5-inch pots.