Waiting for my Xmas trees to shed their greenery before adding them is the best move, right?
One of our Boy Scout fund raisers was to offer curb-side pick up of Christmas trees. We would take them to the City drop-off sites. (The City mulched the trees.)
If there is a similar situation in your area, you could pick up a trailer load of trees in a single location.
P.S. I threw our 2020 Christmas tree into a burn pile at our farm, that I didn't burn due to dry conditions last year. I noticed the tree when I drove by last week - because it still had greenish needles on it and everything else at the farm was brown or gray!
Hopefully, you don't have to slap your trees on the ground a few times before you can put them in your pond!