The vegetative stage V1 is when the first leaf
develops from an aboveground node along the emergence
sprout (Fig. 3). Vegetative stage V2 is defined as one
developed node with two true leaves that are flat.
Subsequent V stages up to VN are based on N developed
nodes on the main axis of the plant, counting the
uppermost last node having true leaves that are flat. Leaf
attachment in Jerusalem artichoke appears to begin in an
opposite arrangement and gradually develops a spiral
phyllotaxy of alternate phyllotaxy leaves. Our results
were similar to those of Kays & Nottingham (2007),