Sunny Boulevard St. John's wort (Hypericum × 'Sunny Boulevard®') is a compact, mounding shrub grown for its bright yellow summer flowers and tidy, fine-textured foliage. Your plant typically matures about 24-36 inches tall with a similar spread, creating an easy, low-maintenance accent for borders, slopes, and foundation plantings.
Plant it in full sun to part shade. More sun generally supports the best flowering and a denser habit, while light shade is tolerated. Provide average moisture and well-drained soil; once established it can handle some drought, but it will look best with occasional deep watering during extended dry periods.
Bloom begins in mid to late summer, with clusters of golden-yellow flowers that stand out against the narrow leaves. After flowering, seed capsules may form and can add late-season interest. If you want to shape the plant, prune lightly after bloom; otherwise, keep maintenance simple by removing any winter-damaged stems in early spring as new growth begins.
This selection is associated with Kalm's St. John's wort, a plant native to parts of the Great Lakes region. Use it as a small hedge, along paths, or mixed with perennials and ornamental grasses for a long season of color and reliable structure.