25 Fresh Flower Seeds Black-Eyed Susan Categorized as a perennial flowering plant, Rudbeckia will grow the first year from flower seeds and later return the following year from deeply established roots. Black-Eyed Susan will also make a great cut flower for bouquets floral arrangements. They are often seen in fields, where they grow in large masses and can be used along fences, as a border plant and even in pots and containers. Deadheading the blooms will extend flowering. Type: Flower Color: Yellow Height: 12" to 36" Tall Width: 12" Spread Season: Perennial Zones: 3 to 9 Environment: Full sun