Do Rudbeckia Self Seed. So every other year they bloom thus called a biennial. Be sure to question your garden center if they are sold as annuals and be aware that the Rudbeckia may or may not reseed in your garden.
Divide every 3 to 4 years. Rudbeckia flowers need a sunny spot with average to rich well-drained soil. This is a great way to encourage the plants to fill in naturalized areas and wildflower.
Rudbeckia seeds are easy to start and the seedlings are pretty tough.
Plant perennials in spring or fall. They are also host plants for several butterflies. Sow seed in early spring and keep seedlings under cover until large enough to handle and pot on then harden off after danger of frost has passed. So every other year they bloom thus called a biennial.