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Select and establish a dominant leader [the primary terminal shoot or trunk of a tree]. Competing stems should be subordinated [pruning to reduce the size and growth of a branch in relation to other branches or leaders
PGR: compounds, effective in small quantities that affect the growth and development of plants
Antigibberelllins: PGRs that inhibit the action of the plant hormone gibberellin
Gibberellin: plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction and leaf and fruit senescence
Why use PGR? Reduce rotation for utility crews, e.g.