Trillium luteum which I only have one of apparently didn't produce any seeds unfortunately.
Trillium grandiflorum (my favorite) had loads of plants come up and flower. This produced the most seeds so far.
After flowering in the spring Trilliums produce a berry. To the left is T. grnadiflorum which varies in size, this is the largest mine created. To the right is T. cuneatum.
Inside the berry it's pretty much hallow besides a few seeds and fleshy material holding them in place.
Each seed has a package of eliasome on it. That's the white stuff, and ants find it irresistible.
They hallowed it out pretty fast.
I tried a few seeds with a Crematogaster colony and they didn't know what to do with them. Some nibbled at the food part while others tried stinging the seed.