instead of burying spells in glass jars, put the contents in a toilet paper tube and synch the ends. it will eventually biodegrade. you can also sigil or decorate them.

this is actually a really great idea

This is several thousand times better than the “not my fault if my spell hurts other living things just by being there, I’m a witch so I have the right to do anything to anyone for any reason” approach to burying glass-container-based spells on public land.