How To Deadhead Rudbeckia. The seed heads can also be cut and dried to propagate new plants. On free-draining soil or during prolonged dry spells they will need additional water to keep the soil around the roots slightly moist but not soggy.
As the blooms dry back you can place a paper bag over the top of the black eyed susan flower and shake the seed head into the bag releasing some of. Deadhead if you do not want volunteer seedlings next season. The seed heads can also be cut and dried to propagate new plants.
Deadheading old flowers will encourage re-blooming and keep the plants looking their best.
Rudbeckia deadheading is easy. You can let the last flowers of the season remain on the plants to go to seed to feed the birds but you will also get a good deal of self-seeding which might not be a bad thing. Regular deadheading of the faded flowers keeps the plants in bloom longer. On Rudbeckia that grow a single flower on each stem cut the stem back to the base of the plant.