- Species and varieties: Rudbeckia, commonly known as Black-eyed Susan, belongs to the Asteraceae family. Popular species include Rudbeckia hirta, Rudbeckia fulgida, and Rudbeckia triloba. Varieties range from single to double blooms, with colors including yellow, orange, and red.
- Hybrid or heirloom: Rudbeckia seeds are available in both hybrid and heirloom varieties. Heirloom varieties are open-pollinated and have been passed down through generations, while hybrid varieties are bred for specific traits such as disease resistance and unique flower colors.
- Pruning and training: Deadheading spent flowers encourages continuous blooming and prevents self-seeding. Cut back the plant to the ground in late fall or early spring to promote healthy growth. Rudbeckia generally does not require staking or training.
- Fertilization needs: Rudbeckia is a low-maintenance plant with minimal fertilization needs. A balanced, slow-release fertilizer applied in early spring can support growth. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Rudbeckia is suitable for USDA hardiness zones 3-9. It is a versatile plant that can thrive in a wide range of climates.
- Climate requirements: Rudbeckia prefers full sun but can tolerate partial shade. It thrives in well-drained soil and can withstand drought conditions once established. Ideal growing temperatures range from 60°F to 75°F (15°C to 24°C).