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Two goldenrods that behave better and spread more slowly than others in mixed plantings, Carey said, are Solidago rugosa Fireworks and the compact cultivar S. sphacelata Golden Fleece.

In 2016 Knapp’s rediscovery of a rare Maryland flower called Solidago rupestris—last seen more than 100 years ago—resulted in headlines calling him “the Indiana Jones of botany.”

In 2016 Knapp's rediscovery of a rare Maryland flower called Solidago rupestris — last seen more than 100 years ago — resulted in headlines calling him "the Indiana Jones of botany."

My new favorite goldenrod is the plumed goldenrod, Solidago plumosa.

“I’m pretty sure I came home sweaty and tired and told her we found the Solidago rupestris” — a bright yellow flower that most others would know as the riverbank goldenrod — “and she said, ‘That’s great, can you take out the garbage?’