root-bound adjective

1. (of a plant) having roots that fill the flower pot, with no more room for them to grow

[TahlilGaran] English Dictionary ▲

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.

[TahlilGaran] English Idioms Dictionary ▲