Hypericum polyphyllum 'Grandiflorum', commonly known as large-flowered St John's-wort, is an upright, clump-forming perennial with narrow, dark green leaves forming dense, bushy foliage. In summer it produces large, bright yellow flowers, creating a striking display in damp soils and along pond margins.
This cultivar is valuable for pollinators and contributes to wetland biodiversity by providing nectar and shelter for insects. Its upright, clump-forming habit and tolerance of consistently moist or shallowly submerged soil make it ideal for pond edges, wet borders, and naturalistic water gardens.
