Leylandii hedges
 

Hello All

I've just bought 3 Leylandii hedges, & I am aware that they can grow as big
as you let them.

But I wondered how far they should be planted away from my Pond, to ensure
that their roots don't interfere with the lining?

I had heard that a tree's roots reach out as wide as the tree, but I don't
know how this applies to hedges.

Any advice would be appreciated.

Thanks,
Regards Al