Answer: You can certainly move the holly if it has grown too big for its planting site. Expect the roots to be concentrated in the top 12-18" of soil and spread out a few feet beyond the longest branch. If you decide to trim it instead of moving it, you can safely remove one-third of the plant without doing too much harm to it. If it needs to be trimmed more than that, plan on reducing its size over a 2-3 year period rather than all at once. This way your holly won't be too stressed out and go into shock.
Best wishes with your project!
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