adjective. having the roots matted or densely tangled.
adjective. (of a potted plant) grown too large for its container resulting in matting or tangling of the roots.
Example sentences of the word rootbound
1. Noun, singular or mass
The most important thing is to transfer the tree before it becomes rootbound.
2. Verb, past participle
Many of these Christmas trees are rootbound and need fresh, new soil so transplant it into the next size pot and quality potting soil three to four weeks after bringing it home.
Running bamboo tends to grow more roots, so a larger container prevents it from getting rootbound quickly.