50ft blue spruce tree root issue
Thank you for contacting "Ask an Expert!"
It is not advisable to cut large roots from a mature tree because the tree is relying on those roots for stability and to gather nutrients (hundreds of fine roots can grow from a larger root) . A mature tree will have a hard time recovering from such a cut, and it could cause long term decline in the tree. If possible, it's best to just work around the root when mowing.