Hypericum prolificum – Shrubby St. John’s Wort

General Information:  Shrubby St. John’s Wort is a native, slow-growing deciduous shrub, as opposed to an herbaceous perennial like most other members of this genus, making it an unusual member of a common genus of plants. Elongated spoon-shaped leaves emerge in spring, followed by dazzling golden flowers that blanket the plant from June through August. These eye-catching flowers are laden with stamens, they create a haven for pollinators as well as an incredible sight for garden enthusiasts. Noteworthy, each flower appears to have a tuft of hair with the number of pollen-producing organs they develop. In fall, a secondary display of color appears, contrasting with other fall foliage; Shrubby St. John’s Wort’s signature golden color returns, and a second round of the golden hue can be enjoyed. Beaked seed capsules appear adding winter appeal along with the reddish-brown stems from the previous season’s growth and interesting peeling bark on mature branches. Shrubby St. John’s Wort is a host plant to several Butterfly and Moth species. The seeds are an important winter food source for birds. Although the flowers are attractive, they produce no nectar and instead are a prolific source of pollen, and thus protein, for native insects. This plant has been used medicinally by Indigenous Peoples in the plant’s native range, however, caution is advised.

Cultivation Details: Although these plants are often found in their native range in moist bottomlands near water sources, they perform exceptionally well in the garden. Shrubby St. John’s Wort is a fantastic companion to other shrubs and can be used complementary to other fall foliage plants such as Juneberry (Amelanchier spp), Maple-Leaf Viburnum (Viburnum acerifolium), Nannyberry (Viburnum lentago), Ninebark (Physocarpus opulifolius), and High Bush Cranberry (Viburnum opulus). Consider planting Shrubby St. John’s Wort in rewilding projects, along borders, fences, foundations, medicinal plant gardens, pollinator gardens, slopes, along forest margins, or near foundations.  An excellent choice in areas with compacted or thin, rocky soils.

Growing Requirements: Plant in full sun to partial shade. Plants in partial shade may not bloom as abundantly as those in full sun. Prefers moist, well-drained soil. Uniquely tolerant of occasionally dry sites, rocky soils, and heavy clay soils. Tolerates wet but not waterlogged soils. Adaptable to sandy, loamy, and clay soils. Suitable for mildly acidic, neutral, and mildly alkaline soils.

Fun Facts: The genus name “Hypericum” derives from the Greek words “Hyper” meaning “above” and “Eikon” meaning “image.” The name refers to the Ancient Greek practice of hanging flowers of this genus above pictures of religious icons.