Please be sure you are picking and propagating American bittersweet and not teh noxious, invasive oriental bittersweet. Bittersweet is great winter bird food. We used to raise and release it from the Howard Nursery. Problem is that there is oriental bittersweet all around us here in the Bald Eagle valley. It's dificult to be sure that those collecting seed only get it from American. Things are further complicated in that the two hybridize, so I won't even collect off our orchard as no way to control hwere the bees have been prior to my orchard. Do a google search and become familiar with the two before spreeding seed and or plants around.