At what height do tree roots become forbidden to use on Shabbat?

ShabbatRabbinic Decrees

Synopsis

Roots three tefachim above the ground are forbidden to use; below three tefachim they are treated as ground. If one side is level with the ground but three sides are elevated, it is still forbidden.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

Discussion coming soon.

The Daily Law

One question. Every opinion. Every morning.

A new halakhic question and the full spectrum of rabbinic thought, delivered daily.