gloxinias

Gloxinia is a common name for flowering plants in the family Gesneriaceae. Traditionally it referred to the genus Gloxinia, named in honor of the German botanist Benjamin Peter Gloxin. In horticulture, however, most large-flowered indoor forms sold as gloxinias are hybrids derived from Sinningia speciosa and related species. Taxonomically, many cultivated gloxinias are placed in Sinningia or other genera, while the market name remains gloxinia.

Description

Gloxinias are tuberous perennials that produce a rosette of fleshy, usually green leaves and, when in growth, tall flowering shoots bearing large funnel- or trumpet-shaped blossoms. Flowers come in a wide range of colors, including red, pink, purple, blue, and white, often with velvety petals. The bloom period commonly occurs in late winter to spring, making them popular as indoor ornamentals.

Cultivation and care

They are typically grown as houseplants in well-drained pots with rich, light soil. Provide bright, indirect light and temperatures roughly between 18–24°C (64–75°F) by day, with cooler nights. Water carefully during the growing season, keeping the soil evenly moist but not waterlogged, and avoid getting water on the crown or leaves. After flowering, many plants go dormant; reduce watering and allow foliage to die back. Tubers can be stored dry or kept barely moist in a cool, bright place until new growth begins. Fertilize sparingly during active growth.

Propagation and varieties

Gloxinias are commonly propagated by division of tubers or offsets. Some cultivars are propagated by leaf cuttings or seeds. The market largely features florist’s gloxinia hybrids, which display a wide array of colors and patterns.

Pests and diseases

Common problems include botrytis (gray mold), powdery mildew, aphids, and mealybugs. Overwatering and poor drainage can lead to tuber rot.