1. Dormant Bud - bud formed
in the previous growing season. Composed of one primary and two secondary
growing points (inner buds) and covered by bud scales.
2. Spur - Previous season's lignified shoot that has
been pruned to contain one to two dormant buds.
3. Cordon - The main branch retained from season to
season in many types of pruning.
4. Scion - Variety of Vitis spp. (Vitis
vinifera in this website) grafted onto a rootstock. A scion may
be budded on to a rootstock as well.
5. Rootstock - Variety of Vitis spp. to which
a scion is grafted or budded. Rootstocks are chosen according to vineyard
soil type, pest resistance, and amount of vigor desired in the grapevine.
6. Trunk - Main supporting part of the vine. Provides
a continuum between the roots and the shoots.
7. Shoot or Cane - Current season's growth originating
from a dormant bud. Upon the initiation of secondary growth and formation
of the periderm, the shoot transitions to a cane. Cane -
more than one half of the shoot has formed a periderm. This is indicated
by a brown color.
8. Graft Union - Site of connection between rootstock