Caltha palustris 'Polypetala', commonly known as the multi-petaled marsh marigold or giant marsh marigold, is a cultivar of the native marsh marigold (Caltha palustris). Here's a concise description of this ornamental plant: Physical Characteristics: Caltha palustris 'Polypetala' is renowned for its extraordinary double or multi-petaled flowers, which give it a lush and full appearance. Unlike the typical single-flowered form, the flowers of 'Polypetala' can have numerous petals arranged in several layers, creating a dense and showy bloom. The petals are bright yellow to golden in colour and measure 1.5 to 2 inches (3.8 to 5 cm) across. The glossy, dark green leaves are heart-shaped and grow in basal rosettes, providing a verdant backdrop to the vibrant flowers. Growing Conditions: This cultivar thrives in moist to wet soil conditions, making it ideal for bog gardens, pond margins, and other wetland habitats. It prefers full sun to partial shade, though it can tolerate more shade in warmer climates. Caltha palustris 'Polypetala' adapts well to various soil types, including clay, loam, and sandy soils, as long as the soil remains consistently moist. Care and Maintenance: Caltha palustris 'Polypetala' is relatively low-maintenance once established. Regular watering is essential, especially during dry periods, to maintain soil moisture levels. Applying a layer of mulch around the plants helps retain moisture and suppress weeds. Deadheading spent flowers can encourage continuous blooming and prevent self-seeding, although this cultivar typically does not spread aggressively. In summary, Caltha palustris 'Polypetala' is an impressive and attractive perennial cultivar prized for its double or multi-petaled yellow flowers and lush foliage. With its showy blooms and ease of care, this plant enhances the beauty and ecological diversity of wetland gardens, providing a vibrant and cheerful display throughout the spring season.