Salix bush... invasive roots?

I have a salix Flamingo tree which I know is grafted, and I have at least one successful cutting at the moment. I know this will grow as a bush and not tree, but I'm desperately trying to find out if it has or is prone to invasive roots? I know my other willows are and don't want to damage property / plumbing.

Could anyone help or advise? Please and thank you

 

Wdyl, it has been grafted so as it can be kept under control. If you grow the cutting on I would suggest you keep it in a pot.