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 plant identification flowers: annuals and herbaceous perennials

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