Wires_Guy_wires
Imperial Masterpiece
I'm doing both tiles and root cutting. The point is that I can't be around to water every day, not even every week. With our summers having months(!) of droughts each year, I want to have a buffer of soil.What is the point of a tile so deep. Seems pointless as a means to develop nebari or limit dept of roots to match bonsai pots because most bonsai pots will be less than 5" deep?
You've also noted that Scots pine handles root pruning really well. In my experience root pruning is a much more precise and reliable tool to develop better nebari than tiles but tiles seem to be on everyone's agenda. Why not just do good root pruning before planting then again each time you dig?
Recently I bought a couple potted seedlings and their taproot was as fat as the trunk and almost as long.
I've also put pond baskets in the ground for easy digging. Just trying all methods I think are feasible.