What is this plant ?

Asked October 5, 2019, 5:17 PM EDT

This came up in my small, damp and mostly shady back yard. It grew taller and taller from about June to August, eventually reaching about 4 feet high. It didn’t bloom until Sept. In the past month, I noticed that more of the same plants have sprouted in the yard, but they are no more than a foot high. The Master Gardener volunteers at the Annapolis Farmers Market couldn’t identify it. Do you know what it is? Many thanks! Ruth, Annapolis

Anne Arundel County Maryland

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