This part of the simulator dominates run times. Grow's job is to grow the Tree's trunk. Growth, or lack thereof, is also a major factor in mortality. Grow toward the direction the Tree found more hospitable during Bask. Update other dimensions derived from trunk size.
Trees can move by however much they grow.
Real Trees are more plastic than this, with crown centers significantly off-center from their trunks. But that's the limit allowed here. Grows by this or a maximum set by the Constant Area Increment Law, which is implemented by saying the area of each successive Tree ring cannot exceed growRingMax . Tree species defining parameters. GLI Global Light Index.