I have to put up a chain link fence around my garden to keep the elk out, 6' heavy fence.

My question is do I have to use concrete around the posts? I will have about 4' in the ground and will be digging the holes with a 10" auger. I have a load of crushed drain stone on the property that I would like to use around the posts as its already there, so free. Thoughts?

I am building a greenhouse with a cold sink per Ryan Mooney's suggestion that will be on one corner that the fence will hook up to. Enclosure is 40' x70' with double gates so I can get my tractor in there to till.

Thanks, Larry