Pelargonium sp. 'Regal Group' (Martha Washington Pelargonium)

Pelargonium (Regal Group), commonly known as Regal pelargonium or Martha Washington geranium, is a horticultural group of large-flowered pelargoniums valued for their bold, patterned blooms and compact, bushy growth. Derived mainly from South African species such as Pelargonium cucullatum and related taxa, this group represents a complex assemblage of cultivars rather than a single species. Plants typically reach 1 to 2 feet in height with a rounded habit and medium green, slightly textured foliage that supports the ornamental display.

The flowers are notably large and often marked with contrasting blotches, veins, or feathered patterns in shades of white, pink, red, purple, and near-black, frequently with darker upper petals. This group is widely grown in containers and patio settings, where individual plants serve as focal specimens. Regal pelargoniums prefer bright light, cool to moderate temperatures, and well-drained soil, with moderate watering and good air circulation. They perform best in USDA zones 10 to 11 and require protection below about 35 F. Flowering is concentrated in spring to early summer, with some modern cultivars extending the bloom period under favorable conditions.