The wreaths are put there by thousands of volunteers across the country at their local national cemetery the weekend before Christmas.
My mom and dad are buried at Arlington, and since I have never been there during December, I had to think if they even put wreaths at Arlington, because there are a lot of people interred there, and I saw this:
"...On Saturday, December 14, 2019 at 8:30 AM, volunteers will lay 253,000 veterans wreaths at Arlington National Cemetery just outside our nations Capital. These wreaths symbolize a commitment to Remember and Honor our nations veterans through the laying of wreaths on the graves of our countrys fallen heroes and the act of saying the name of each veteran aloud..."
I must admit, it was nice to read this. I am familiar to the Wreaths Across America group, and am gratified to hear they have enough people to get that done in a matter of weeks. That means they get a LOT of people to do it, so there are still a lot of people who care.