You can shop potted Rudbeckia fulgida "Goldsturm" from Thompson & Morgan. “Another wonderfully rewarding and long flowering perennial, and one I would highly recommend, is the lesser known ...
They would definitely work in containers but I am prone to put them in pollinator gardens with Luscious lantanas, Indian Summer or Prairie Sun rudbeckia, Color Coded coneflowers and various agastache.
Prune back to just above the lowest bud. Russian Sage Bluesette (Ball Horticultural) Rudbeckia Black-eyed Susan — ‘Goldsturm’ Black-eyed Susan was named Perennial Plant of the Year in 1999 ...