Derbyshire,
United Kingdom 
i have a Salix "Green Curls" twisted willow in my small garden is it a threat tothe houses drainage system?
9 Oct, 2010
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Not much info on this, but the type is a dwarf (to 5 m. )tree so generally speaking the roots will not normally penetrate drains in good order. Any tree will get its toots into damaged drains though.
9 Oct, 2010