Cutleaf coneflower
Rudbeckia laciniata · Asteraceae
The gardener's calendar
Ideal time to plant cutleaf coneflower: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Blooming
- July to October
- Adult size
- 1.50 to 2.50 m tall × 0.60 to 0.90 m wide
- Growth
- Fast
- Hardiness
- Excellent, down to -20 °C
- Origin
- North America
- Soil type
- All soils, even poor and dry
- Exposure
- Sun to partial shade
Care
Watering
Water regularly when planting and during dry summer spells. Once established, rudbeckia tolerates drought well and needs only occasional watering. Avoid excess winter moisture, which can encourage root rot.
Exposure
Plant in full sun for maximum blooms and better vigor. It also accepts partial shade but will flower less abundantly. A sunny spot strengthens overall plant vigor.
Soil
Rudbeckia adapts to nearly all soil types: ordinary, poor, chalky, or slightly acidic. Good drainage is desirable, especially in winter. Overly rich soil favors growth at the expense of flowering.
Pruning
Deadhead spent flowers regularly to extend blooming. In autumn or late winter, cut stems back to 10–15 cm from the ground. This pruning encourages vigorous branching the following spring.
Fertilizer
A modest application in spring is more than enough. Prefer a balanced fertilizer or one low in nitrogen. On naturally poor soil, a light feeding at the season's start boosts growth without excess.
Diseases and pests
Rudbeckia is very resistant. Watch for slugs on young plants. Powdery mildew may appear with stagnant moisture and poor air circulation. Open pruning and proper spacing limit these issues.
Did you know?
The lacinate rudbeckia became famous in the United States in the 19th century and inspired the baseball nickname, with the 'yellow flower' associated with American pride. The name 'Rudbeckia' honors Swedish botanist Olof Rudbeck; its spectacular double pompom-shaped flowers result from selective breeding carried out for over a century.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.