instead of jars to bury your spells in, my i suggest the idea of peat pots planters?
not only are they biodegradable, they are useful for many different things. you can grow herbs and starter plants or use them to bury a home protection without the fear of broken glass rising to the surface, or your jar staying in the ground for a 100 years. they also come in many different sizes as well. from large to very tiny
and you can even make your own from left over toilet paper rolls for a byproduct option that lessens garbage going into landfills.
there are plenty of cheaper, earth friendlier options available to us, as witches, at our disposal. it is up to us as a whole to start making better earth friendly choices, to modernize the practice. we are not from the middle ages and tradition has nothing to do with glass jars - we have the knowledge in modern days to realize how harmful the practice of burying jars actually is, we have resources to change that as well.