"Jaques d'Alltrades" wrote in message
...

Actually, if a pollard tree is trimmed regularly, the roots on that will
stabilise. The thickness of the trunk is almost immaterial, as the

So you are saying that however thick the trunk grows, the roots stay the
same size. In that case the tree would just fall over!

I can show you street trees that have always been regularly trimmed by the
council. The roots are pushing up the tarmac and are thicker than the
branches.

- Arthur