Black-eyed Susans are hardy perennial wildflowers that grow in a wide variety of conditions. They are drought resistant and require little care. They can also self-seed from year to year or, like other perennials, be split at the root base.
Decide where to grow your black-eyed Susans
Black-eyed Susans grow best in bright sun and don't require quality soil. Keep in mind that these plants can take over your garden space within just a few years, even smothering out other plants. Choose their placement carefully.
Purchase or obtain seeds
Seeds are easily purchased from markets or garden stores, or if you have these plants already in your yard, you can harvest them yourself. However, be aware that the new plants may not grow to the same height as the parent plant.
Spread seeds over the soil
Simply toss your seeds onto the soil in a thin layer. You don't need to cover them up or do anything special to encourage them to grow. You should see sprouts and seedlings shortly.
Care for the plants
You need do almost nothing to keep the plants healthy. Water only if there is an extended period of drought. Remove faded or dead flowers if you want the flowers to bloom again, but be aware that this prevents those seeds from growing into new black-eyed Susans, which is problematic if you want your flowers to spread.
Expect fall die-off
Don't be concerned when the flowers turn brown and wither as winter approaches. This is expected. Cut them down to the soil if you wish. Come spring, they will grow again and you can enjoy another season of bright, yellow flowers.