Anthonies as seen in Episode 2
Grief Seed & Witch's Kiss
The Grief Seed Gertrud dropped is a round ball decorated with thorned vines and topped by the rose and butterfly symbol.
Gertrud Grief Seed from Puella Magi Madoka Magica Portable
Speculation and analyses
These posters were put up throughout Japan in order to promote a new event. The pictures are taken from this website.