regal geranium

The regal geranium, technically Pelargonium × domesticum, is a hybrid pelargonium that produces large, ornamental flowers on compact, upright plants. Unlike their seed-propagated cousins, regals are sterile hybrids requiring vegetative propagation from cuttings, which makes them more expensive to produce but ensures uniform quality. The flowers are notably larger and more heavily textured than zonal pelargoniums, often reaching 5 cm or more across, with ruffled petals and bold color combinations: deep reds, purples, pinks, and whites, frequently with contrasting blotches or picotee edges.

Regals demand more precise growing conditions than standard geraniums. They require cooler night temperatures, typically 10 to 15°C, to set flower buds; warm nights suppress flowering entirely, which limits their commercial use in hot climates or poorly ventilated greenhouses. They also prefer consistent moisture and good air circulation to prevent botrytis, and they cannot tolerate the heat and drought stress that zonals shrug off. This makes them primarily a cool-season or greenhouse crop rather than a landscape staple.

Propagation and Production Timing

Growers propagate regals from softwood or semi-hardwood cuttings taken between summer and early autumn. Rooting typically takes three to four weeks at 18 to 20°C. Because flowering is photoperiod and temperature sensitive, commercial producers time propagation carefully: young plants are often held at cool temperatures under reduced light to initiate flowering buds before delivery, ensuring customers receive plants in bloom or bud rather than bare vegetative growth.

The regal geranium earned its name from its showy, almost theatrical appearance; Victorian plant collectors prized them as specimen pot plants for conservatories and formal drawing rooms. The name persists in horticulture, though "regal pelargonium" is more botanically precise. In the nursery trade, they occupy a middle tier: more expensive than seed geraniums, more reliable than some tender perennials, but demanding enough that their care instructions are always printed on the label.