We have an approximately six foot tall plant growing in our flower bed that I don't recall seeing last year. It resembles queen anne's lace, except for a few distinct features. It has a smooth stem with purple splotches, the flowers are white and formed in small clusters at the end of a skinny stem that is about 2 inches long, and there is no coloration on the leaves. I am concerned that it is poison hemlock, but not sure how to confirm this. If it is poison hemlock how do we go about getting rid of it?
Yes, this is poison hemlock. Here is our webpage with information on its removal: https://extension.umd.edu/learn/toxic-plant-profile-hemlock
Here's a very good site for comparison to look-alikes for Giant Hogweed that includes poison hemlock: https://www.dec.ny.gov/animals/72766.html