@Fire they are talking about fruit trees and Olives, not native English woodland, as I say it's only an expression they use, meaning our trees don't normally have to go too deep to find water.
I have the same problem with a wild plum tree growing on the verge outside my honeysuckle/leylandii hedge @Topbird. The latter two are easy to control with a root barrier but I didn’t anticipate the plum roots growing deep down past the barrier and up through the raised bed. That is also now a mass of roots in less than a year!
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
Another excellent book on how trees communicate with each other is the novel Overstory by Richard Powers. The Hidden Life of Trees by Peter Wohlleben is excellent - thoroughly recommended. I haven't read the Secret Life of Trees by Colin Tudge - but will see if the library has it.
@Nollie - I had to laugh at myself but to be honest I could have cried when I realised what I'd done.
All that time and money to essentially feed and water a walnut tree I didn't even want - they're very messy trees and the squirrels got most of the walnuts. It's gone now.
Heaven is ... sitting in the garden with a G&T and a cat while watching the sun go down
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The Hidden Life of Trees by Peter Wohlleben is excellent - thoroughly recommended.
I haven't read the Secret Life of Trees by Colin Tudge - but will see if the library has it.
All that time and money to essentially feed and water a walnut tree I didn't even want - they're very messy trees and the squirrels got most of the walnuts. It's gone now.