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General: Globular, 2-15cm in diameter, very variable, some making large clusters in age, flowers 20-50mm, white, yellow to pink. P. simpsonii the most widespread species, from southern Canada to southern USA. Very cold hardy. Some species hard to grow and are best grafted.
Growing: Full sun, water weekly in summer, most species tolerate low temps in winter, some very cold hardy, down to -20 depending on origin.
Habitat: USA (Canada)
Copyright Mats Winberg