Rudbeckia hirta

Flower name
Rudbeckia hirta
Scientific name
Rudbeckia hirta
Aliasアラゲハンゴンソウ, 荒毛反魂草, Rudbeckia hirta, Black-eyed-Susan
Place of originNorth America
Place of floweringFields and footpaths, Garden
Flowering seasonJuly, August

What is Rudbeckia hirta

Rudbeckia hirta or Black-eyed-Susan (scientific name: Rudbeckia hirta), one of the representative varieties of Rudbeckia, is a cold-resistant perennial or annual herb native to North America in the Asteraceae family. It is also known as Black-eyed-Susan, and Aragehangonso or Matsukasa-giku in Japanese.
The grass is 40 to 90 cm tall. In summer, inflorescences grow out from between the spatula-shaped rhizomatous leaves and produce yellow or orange head flowers 6 to 10 cm in diameter. The flowers have a shiny brown central core that is raised high. The long, slender stems are easily disrupted by the wind, and the grass is often tied up with string.

Origin of the name

The genus name “Rudbeckia” is a dedication to botanists Dr. Olof Rudbeck the Younger and Dr. Olaus Rudbeck. The species name “hirta” means “hairy” in Latin and refers to the white hairs on the stem and leaves.

Cultivated Varieties of Rudbeckia hirta

From left to right, 'urban safari', 'Cappuccino', 'Prairie Sun', 'maya'

＊Rudbeckia hirta 'Urban Safari': The flowers are semi-double, branching well to produce numerous flowers, with a compact height of 40-50cm.
＊Rudbeckia hirta 'Cappuccino': With approximately 12 petals, the base of the petals is reddish-brown transitioning to yellow-orange at the tips, while the central tubular flowers are brownish, reaching a height of 30-70cm.
＊Rudbeckia hirta 'Prairie Sun': The petals come in two colors, yellow-orange and yellow, with a diameter of 12cm, while the central tubular flowers are yellowish-green.
＊Rudbeckia hirta 'Maya': Double-flowered in yellow, with the central tubular flowers being brownish, and compact at a height of 45cm.

Common name: Rudbeckia hiruta, scientific name: Rudbeckia hirta, origin: North America, height: 40-90 cm, leaves: spatula-type, Leaf length: 5-20 cm; Leaf shape: rhombic-lanceolate; Leaf margin: entire/serrate; Inflorescence: monocarpate; Corolla shape: head flower; Flower color: yellow/orange; Flower diameter: 6-10 cm; Flowering season: July to September; Reproduction: insect-pollinated,Fruit type: achene, Seed number: 1, Uses: garden planting, potted planting, Cut flowers, dried flowers, pressed flowers.