hybrid willow

Question

Are the roots invasive when planting 25 feet from septic lines?

Answer 1

Willow is considered highly invasive and these articles will help you.

http://www.na.fs.fed.us/fhp/invasive_plants/weeds/weeping-willow.pdf
https://www.gardeningknowhow.com/ornamental/trees/tgen/trees-with-invasive-roots.htm