What is this weed?
We cannot say for sure but this looks like it may be Pseudognaphalium obtusifolium, rabbit tobacco, sweet everlasting. Compare the characteristics
Marion, thanks for your response. You have identified the plant! Wish it had a nicer name than "rabbit tobacco." I think I like "sweet everlasting" better as it is a "beautiful plant". Are rabbits attracted to it because they eat the plant? Is this plant a native? I am disposed to let it grow. rather than pulling it up. Thanks, Sandy Ceely
In checking with the Maryland Biodiversity Project link above, it is a native plant and so would be great to allow to grow.
We don't know why it has rabbit in the name, but that page also shows "Fragrant cudweed" and "Catfoot" as other common monikers if you like them better.