shrimp food

Hi all, I recently acquired some bits n bobs and amongst these were some Alder cones, some Bonsai shrimp baby food and some unlabelled largish leaves (Photo attached). I hate to throw anything out so I was wondering if I should use these in my tank. My tank is a 330Lish community set up and has...

What leaves are safe for shrimp and how should they be prepared for adding to a tank ?