Answer: Expect the majority of roots to be in the top 12 inches of soil and out as far as the branch tips. Dig a trench all around the plant at the dripline and then dig down and towards the center of the plant. If you want to save the forsythia to plant elsewhere, be careful not to sever the main roots (cutting through the fibrous roots is okay). Then continue digging and prying beneath the root mass to free the plant. If you don't want to save it, just cut it back so you can dig more easily. It's important to get the entire root mass out or it will simply sprout up again. Good luck with your project!
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