Answer: Yes, black-eyed Susans and purple coneflowers are perennial flowers that will grow and last for years in your garden as long as they are happy. They need full sun, well-drained soil, amend the soil yearly with compost and they should reward you with beautiful blooms. They also should be divided every 3-4 years if they start spreading too far. This will yield new plants too. What a bonus!
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