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Root crown [ Botany ]
Synonym: Root collar, Root neck

Dictionary of botanic terminology - index of names

  The point at which the root and stem of a plant meet and the primary vascular anatomy changes from that of a stem to that of a root  
The transition point between stem and root. The area of the axis of a plant where the tissues differentiate into stem and root and merge to each other. Normally this area appears swollen or tapered, but can also be constricted and very thin, and is located near or at soil level. It may be clearly or vaguely apparent.

The collar is a vulnerable area prone to fungal  diseases known as collar rot or crown rot.



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