Should I plant with this metal ring still attached

Started to swap the plastic plants from my tanks and bought this one to see how it goes, probably a daft question but do I plant in with the foam and metal ring or remove them both, I'm worried the metal will leech stuff in to the water.

Started to swap the plastic plants from my tanks and bought this one to see how it goes, probably a daft question but do I plant in with the foam and metal ring or remove them both, I'm worried the metal will leech stuff in to the water.