Lobelia cardinalis – Cardinal Flower

The Cardinal Flower is a true horticultural star, offering one of the most intense and purest reds in the plant world. This Canadian native perennial proudly raises flamboyant flower spikes that seem to vibrate above deep green foliage. A literal beacon for hummingbirds, it transforms wet areas and pond edges into a striking visual spectacle from mid-summer until the first signs of autumn.

Characteristics

• Foliage: Features rich green, lance-shaped leaves that can sometimes be tinged with bronze. Deciduous, the foliage forms a compact basal rosette.
• Flowering: Produces terminal racemes of brilliant scarlet-red tubular flowers from July to September.
• Light: Thrives in full sun to partial shade. In full sun, it requires constantly waterlogged soil.
• Habit: Displays an erect and columnar habit, providing sharp and elegant verticality.
• Growth: Displays moderate growth, reaching approximately 90 cm in height with a restricted spread.
• Soil: Prefers rich, humus-heavy, and especially very wet soils. Perfectly tolerates clay soils.
• Temperature: Excellent Canadian hardiness, adapted up to zone 3.
• Resistances: Resists diseases well in humid environments; generally avoided by White-tailed deer.

Use

• Types of use: An essential element for water gardens, stream banks, rain gardens, or very cool flower beds.
• Decorative advantages: Offers a powerful chromatic contrast and a vertical structure that catches the eye from a distance.

Maintenance

• Watering: Crucial. The soil must remain moist at all times. It does not tolerate any drought.
• Fertilization: Apply rich compost or an organic fertilizer in the spring to support blooming vigor.
• Pruning: Cut back flower stems after blooming to encourage the formation of the winter rosette.
• Planting: Space plants 30 cm apart. Ensure the crown is not buried too deep.
• Winter Protection: A light mulch of fallen leaves helps prevent frost heaving without smothering the rosette.