Kalm's St. John's Wort

Hypericum kalmianum is a compact and very hardy ornamental shrub, valued for its abundant bright yellow flowers and high tolerance to difficult conditions. This North American species is distinguished by its numerous star-shaped golden-yellow flowers with prominent stamens, which appear in summer and strongly attract pollinators. Its general habit is rounded, dense, and naturally well-branched, with a wider than tall silhouette, making it an excellent choice for borders, foreground plantings, and group plantings. The deciduous to semi-evergreen foliage, depending on the climate, is bluish-green and provides a fine and decorative texture throughout the season. Very hardy and easy to maintain, Hypericum kalmianum is particularly appreciated for sustainable landscaping, naturalistic gardens, and exposed areas where few shrubs thrive long-term.