What is this plant ?
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
Hi - This looks like white snakeroot (Ageratina altissima). https://www.marylandbiodiversity.com/viewSpecies.php?species=4179
It is a Maryland native plant that spreads by seeds.