Tree & Shrub Growth Regulation

The certified arborists at Plant Health Solutions have years of experience using plant growth regulators in both trees and shrubs. Growth regulators exist naturally in plant materials. By applying specific doses of GR at appropriate times, plant metabolism can be regulated, slowing the vegetative growth by inhibiting gibberellin biosynthesis. This will gently and predictably slow the growth of treated trees and shrubs. This can effectively extend the pruning cycles of these materials and reduce the amount of woody growth that must be removed. Depending on the species being treated, the growth regulator will also cause an increase in root density, improved drought and heat resistance, and higher tolerance to insects and diseases. These applications will also help trees which have been stressed by construction or other root damage.

Research shows that growth regulator gently slows the growth of trees, allowing them to redirect much of their energy from canopy growth to defense chemicals, fibrous root production, and stored energy.

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The reallocation of energy makes these trees healthier and more durable. Through soil injections, the growth regulator is absorbed by the roots and transported in the xylem to the

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growing points where it blocks formation of the hormone gibberellic acid, which is responsible for cell elongation.

Foliar spraying of growth regulator on shrubs and other landscape plants can help maintain a manicured appearance while greatly reducing the maintenance.

The picture here, taken in September, shows minimal growth of this Boxwood hedge after spraying growth regulator in the spring.