84-98 days maturity. Rudbeckia hirta. Rudbeckia Black-Eyed Susan Seeds. Non-GMO, Perennial. Ornamental. Black-Eyed Susan seeds grow some of the season's most timeless and familiar blooms of varieties native to the United States. Black-Eyed Susan rudbeckias are hardy outdoor favorites for growing unique, yet brilliant colors for lining the back of the garden or showing off on the patio. Black-Eyed Susan seeds grow classic 12-36 inch rudbeckias bursting with neat 2.5 inch blooms of delicate daisy-like golden yellow petals around a smokey chocolate center. Black-Eyed Susan is easy to grow from seed and is known to thrive in a variety of gardens prone to heat, drought, and poor soil across North America. About 100,000 seeds per ounce.