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Jin Guangju (with photos)
Rudbeckia, commonly known as Black-eyed Susan, is a genus within the Compositae family, typically grown as a perennial for 1-2 years. It features rough, hairy foliage and can reach heights of up to 2 meters, with multiple branches. The basal leaves are pinnately divided into 5–7 lobes, while the stem leaves are 3–5 lobed, with sparse serrations along the edges. The plant produces one or more flower heads on long stems. Each flower has a round, ray-shaped structure with lanceolate, drooping petals that are approximately 3 cm in length, displaying a striking golden yellow color. The central tubular flowers are yellow-green, and the blooming period usually occurs from July to September.
This genus includes several popular varieties such as Coneflower (Echinacea), which has toothed leaves, double-leaf forms, and showy, eye-catching blooms. Rudbeckia is known for its strong adaptability, thriving in both cold and dry conditions. It doesn’t require rich soil and is easy to grow, making it an ideal choice for gardens in the Shanghai region, where it can maintain its beauty over many years. For best results, choose well-drained sandy loam soil and plant it in a sunny, well-ventilated area.
Propagation is best done in spring or autumn. Before flowering, applying liquid fertilizer and keeping the soil consistently moist will promote abundant blooms. However, careful watering is essential—overwatering may lead to taller plants and increased risk of lodging.
Rudbeckia is widely used in garden design, particularly for large plant types that work well as flower beds, borders, or natural grass edges. Its vibrant, long-lasting flowers make it a perfect addition to public green spaces, such as parks and streets. In Shanghai, it thrives in local conditions, offering a long flowering period and minimal leaf drop, making it a favorite among gardeners and landscapers alike.