Here are the differeces between a Black-Eyed Susan and a Sunflower:
Sunflowers tend to grow taller than black-eyed Susans, generally reaching heights between 3 and 10 feet tall, with some varieties growing as high as 16 feet.
Black-Eyed Susans may live longer than sunflowers.
Sunflowers produce edible seeds that may be harvested at the end of each flowerhead's life and eaten either raw or roasted.
Black-eyed Susans are tolerant of strong wind, while sunflowers tend to develop tattered foliage in windy situations.
Black-eyed Susans (Rudbeckia hirta) are native to North America and one of the most popular wildflowers grown. They tend to blanket open fields, often surprising the passerby with their golden-yellow beauty.
Members of the sunflower family, the “black eye” is named for the dark, brown-purple centers of its daisy-like flower heads. These plants bloom from June to October.
Tip! Learn How to Plant, Grow, and Care for Black-eyed Susans at Old Farmer’s Almanac.