Rudbeckia have bright, daisy-like, composite, 7 - 10 cm wide, yellow flowers, which are yellowy/orange and brown centred, being produced for up to 10 weeks throughout summer.
The flowers have a prominent central cone which gives the plant its common name.
These plants spread by rhizomes, so therefore have a variable spread.
They are easy to grow and reward with splashes of vibrant colour.
Best planted en-masse, especially in drifts in mixed borders.