This plant is a volunteer. If it's a tree, we may want to keep it. If it's a shrub, we don't. Is it a mimosa? Honey locust? Something else? Picture taken 11/3/19 near the DC/MD border. About 5 inches high.
Good morning. This is a mimosa seedling (Albizia julibrissin). They are non-native trees that are invasive in this area. We do not recommend planting it. https://www.invasiveplantatlas.org/subject.html?sub=3004
Here is more information about invasive plants. https://extension.umd.edu/hgic/topics/invasive-plants
If you are looking for ideas for trees to plant, this is a good basic list. https://dnr.maryland.gov/forests/Pages/MarylandersPlantTrees/Recommended-Tree-List.aspx
In Washington, DC, Casey Trees is a great resource as well. https://caseytrees.org/tree-species/
I am extremely grateful for your response. Thanks so much!!!