root-bound
root-bound {adj.}
1. Having a limited amount of space for root growth.
After seven or eight years day lilies become root-bound and will not bloom well unless they are divided.
2. Liking the familiar place where you live and not wanting to go away from it; having a sentimental attachment to one place.
Mr. Jones has lived in Connecticut all his life. He is too root-bound to consider moving to another state.
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Source: A Dictionary of American Idioms