That's an interesting thought. I imagine that it would be a very difficult chore. I used a shovel to carefully work soil into the cracks. Then gave it a boot stomp or two as needed. It seemed to work well.
The tales of Humphrey & Bogart might also be useful. They didn't want to embed properly so the bare links are below. Good luck in your hugel adventures!!!
Hi, very interesting. The headline made me think of the vibrating compactor used for pavers. Then after reading the post I think about the vibrating rods used for cement walls when building. Its round, long, and might work if you can find one to rent. You might try putting sticks out of the mound as you pour dirt in and put a sander on it and it will vibrate a little. Don't know if it will work though.
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Edible Landscaping With A Permaculture Twist/ Second Edition - Kickstarter