When is the Best Time to Consider a Growth Regulator for Your Landscape?
Growth Regulator: In this episode of the Building Roots podcast with TreeNewal, host Wes is joined by Emmett Munich from ArborJet to discuss the fascinating topic of growth regulators, focusing on Paclobutrazol. Emmett explains how growth regulators work and their role in plant management. Unlike other plant healthcare methods that affect the external environment of trees, Paclobutrazol works internally, altering the tree’s physiology. The compound inhibits the growth hormone gibberellic acid, reducing cell elongation and internodal growth while maintaining the same number of leaves. This results in a more compact growth with smaller, darker, and denser green leaves.
The benefits of Paclobutrazol are diverse. They range from reducing pruning trips for line clearance companies and shrub management to improving tree health, drought management, and stress reduction. It can even be used for safety purposes and managing tree growth in limited spaces.
The application is typically done through soil drenching or injection, with caution needed to avoid overregulation and potential effects on nearby plants. The efficacy of Paclobutrazol varies across tree species, with red oaks and live oaks responding particularly well. The timing of application is important, as growth inhibition occurs the following spring when applied in fall, winter, or early spring, while summer applications show effects in the subsequent spring. Emmett emphasizes the importance of accurate dosing and encourages arborists and homeowners to consult experts for guidance.
Overall, Paclobutrazol is a versatile and underutilized tool in the plant healthcare toolbox. It offers numerous benefits for tree management and enhancing overall tree health and appearance.
Discover more reasons why working with an arborist can safeguard the future of your trees!
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