Back in 2015, I thought the whole 'soil decompaction with an air spade' thing was a gimmick
We had a huge pin oak in a park in Columbus that was really struggling, and the city arborist insisted we try it. I figured it was just moving dirt around, but after we did a grid of holes and backfilled with compost, the tree put on almost 8 inches of new growth the next season. What's something you guys were totally wrong about at first?