Which perennials bloom in late summer/early fall?

FAQ
Question: 

Which perennials bloom in late summer/early fall?

Answer: 

Late summer/early fall blooming perennials include New England aster (Aster novae-angliae), New York aster (Aster novi-belgii), boltonia (Boltonia asteroides), garden mum (Chrysanthemum x morifolium), sneezeweed (Helenium autumnale), showy stonecrop (Hylotelephium spectabile), and goldenrod (Solidago hybrids). 

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