I'm trying to tube some trees, to force them to grow large. I planted my sapling in a 1x1x2 hole, but this happened:
Was tree tubing nerfed at some point?
Ok, I've done some research of my own, and the following seems to be the case:
Tree tubing does work, but not with dirt
Using dirt tubes of height 2 and 3, normal trees still grow:
However, using cobblestone tubes, large trees always grow: