Solidago rugosa ‘Fireworks’ is a cultivar that forms a bushy clump with dark-green leaves.  The bright yellow blooms appear beginning in late summer into fall and resemble fireworks.  Like other goldenrods, it attracts numerous pollinators and serves as a host plant. 
Sow outdoors shallowly in late fall and keep moist in protected area.  If sown indoors requires 60 days cold stratification.