Hypericum kalmianum is a native North American shrub that is hardy in USDA Zones 4-8. It is found growing naturally in moist, open areas and along the edges of woodlands throughout the northeastern and north-central United States and eastern Canada. This compact, deciduous shrub typically grows 2-3 feet tall and wide at maturity. Its key features include: Foliage: The small, linear-shaped leaves are blue-green in color and have a slightly glaucous appearance. The foliage turns an attractive reddish-purple in fall. Flowers: From midsummer to early fall, Hypericum kalmianum produces an abundance of bright yellow, 5-petaled flowers. These blooms are about 1-2 inches wide and add a cheery pop of color. Growth Habit: With a rounded, spreading growth habit, Kalm's St. John's Wort forms a dense, well-branched shrub. It spreads slowly by suckers to form colonies. Cultural Needs: This native shrub prefers full sun to partial shade and moist, well-drained acidic soils. It is drought-tolerant once established. Landscape Uses: Hypericum kalmianum makes an excellent addition to native plant gardens, woodland edges, or foundation plantings. Its compact size makes it suitable for smaller landscapes. Wildlife Value: The nectar-rich flowers provide an important food source for pollinators like bees and butterflies. The foliage also serves as a larval host for certain moth species. Overall, Kalm's St. John's Wort is a hardy, low-maintenance shrub that offers season-long interest and valuable ecological benefits in the garden.
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