Black-Eyed Susan (Rudbeckia) Seeds

2026-04-27T21:08:27-03:00

Rudbeckia, also known as “Black-Eyed Susan,” is a cheerful and robust perennial, recognized for its vibrant yellow flowers contrasted by a dark center. It blooms from mid-summer until autumn, offering a long period of color and structure in the garden. It is suitable for both flowerbeds and containers and is an excellent choice for low-maintenance gardens and pollinator-friendly spaces, attracting bees and butterflies throughout the flowering season.

Where to Grow Rudbeckia?
This plant is adapted to zones 3 to 9. It grows well in full sun and tolerates a wide variety of soils. It thrives particularly well in moderately dry or well-drained soils. It is ideal for borders, wildflower meadows, and container gardens.

History and Traditional Uses
Native to North America, rudbeckia has long been used by indigenous peoples and herbalists for its potential medicinal properties, particularly to support the immune system. It also holds an important place in ornamental gardens due to its reliability, beauty, and its role in supporting pollinators.

Information for Canadian Zones
Zones 8-9: Sow directly in fall or early spring for vigorous blooming.
Zones 5-7: Sow indoors or directly in spring after all risk of frost has passed.
Zones 3-4: Start indoors 6 to 8 weeks before the last frost, then harden off before transplanting.

How to Grow and Harvest Rudbeckia

Planting: Sow seeds 3 mm (1/8 in) deep, spacing plants 30 to 45 cm (12 to 18 in) apart in well-drained soil.
Watering: Water regularly until plants are established, then reduce to occasional deep waterings.

Harvesting: Regularly cut flowers to encourage continuous blooming; leave some flowers to go to seed.

Maintenance: Deadhead spent flowers to prolong blooming or leave seed heads for birds and to encourage self-seeding.

Tips for Harvesting Seeds for Future Supply

Selecting Flower Heads: Allow seed heads to dry completely on the plant.
Harvesting Seeds: Cut dry heads and place them in a bag; shake to release seeds.
Drying and Cleaning: Further dry seeds indoors if necessary, then clean and label them.
Storage: Store in airtight containers in a cool, dry place. Seeds remain viable for up to 4 years.