A root crown is that part of a root

Root

In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. This is not always the case, however, since a root can also be aerial or aerating . Furthermore, a stem normally occurring below ground is not exceptional either...

 system from which a stem arises. Since roots and stems have quite different vascular

Vascular tissue

Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally. There are also two meristems associated with vascular tissue:...

 anatomies, major vascular changes take place at this point.

Root-crown temperature has been found to affect plant growth and physiology in a number of ways.

A number of pests and diseases affect specifically this part of the plant, including root-crown rot (or root-crown fungus) and a number of species of root-crown weevil.

The root crown area usually appears swollen, tapered, constricted or very thin

Thin

Thin may refer to:*People with lean narrow physiques, see emaciation and underweight* Thin client, computer in client-server architecture networks* Thin film, material layer of about 1 µm thickness...

- as well as a combination of these. The area of the root crown is usually located around or at the soil level and can be vaguely or clearly apparent.