I) tree or other plant removed from the ground for re-planting without soil around the roots (contrast with balled and burlapped. container grown. containerized. and in-ground fabric-bag grown). 2) the harvesting or transplanting of a tree or other plant without soil around the roots.
bare root (Wikipedia)
Bare root is a technique of arboriculture whereby a plant is removed from soil in a dormant state, from which it can more rapidly acclimate to new soil conditions.
Bare root stock should be planted within 48 hours of receipt for optimal results.