To care for black-eyed Susans in the fall, remove the flowers heads, store some seeds, and remove any infected leaves. Compared to other plants, black-eyed Susans require minimal care in the fall.
- Remove flower heads
Take off the flower heads gently using your hands or pruners so as not to disrupt the rest of the plant. Removing the flower head helps conserve nutrients for the rest of the plant. Leave a couple old flower heads on the plant to become seed heads if you want to save seeds to grow in the spring.
- Save seeds for planting
If you left some flower heads to become seed heads, collect some of the seeds two to three weeks after flowering. Store seeds for next season in an air-tight container in a cool and dry location. Leaving seed heads on the plant provides something for the birds to enjoy, and allows the black-eyed Susans to reseed naturally as the seeds fall and disperse.
- Remove any infected leaves
Remove any leaves with Rudbeckia leaf spot, a common fungal infection in black-eyed Susan plants. These dark-brown spots begin small but can grow during summer months and can survive through the winter. Removing the infected leaves prevents the infection from spreading.