Black-eyed Susans are indeed perennials that will return year-after-year but not forever! Usually, they are in full bloom in July when it’s hot and sunny. We tend to seed Black-Eyed Susans in the spring once the soil temperature has reached 70°F for best seed germination. In many parts of North America, the planting period is March to May. The plant will flower June to September. Germination takes 7 to 30 days. That said, you could try seeding later in the summer or fall for flowers next year. This is how wild flowers reseed themselves. Why not. They’re just seeds. See what happens. If you wait until spring, store seeds in a cool, dry place.
Black-eyed Susans are indeed perennials that will return year-after-year but not forever! Usually, they are in full bloom in July when it’s hot and sunny. We tend to seed Black-Eyed Susans in the spring once the soil temperature has reached 70°F for best seed germination. In many parts of North America, the planting period is March to May. The plant will flower June to September. Germination takes 7 to 30 days. That said, you could try seeding later in the summer or fall for flowers next year. This is how wild flowers reseed themselves. Why not. They’re just seeds. See what happens. If you wait until spring, store seeds in a cool, dry place.