What are tree growth regulators?

Tree growth regulators reduce a tree’s growth rate by 40-70% over a three year period. TGR’s are applied to the soil and absorbed through the roots. TGR’s gently slow the growth of trees and redirect the stored energy to produce defense chemicals,
fibrous root production and other uses. This reallocation of energy makes your tree more healthy and durable, and at the same time controls its size.

What TGR’s do for your tree?

  • Maintain the visual aesthetics of your landscape.

  • Reduce the amount of live wood needing to be pruned.

  • Slow down overcrowding of competing trees.

  • Maintain a smaller, more appropriate tree size when there is a restricted root zone.

  • Maintain vista views with lesser need for pruning.

  • Extend the time in between recommended pruning.

  • Minimize intrusion by power companies.

The benefits don’t stop!

As a result of growth reduction, more awesome benefits are made available for your tree.

  • Stimulate fine root production.

  • Improve drought and heat resistance.

  • Higher tolerance to certain diseases.

  • Leaves are greener with higher amounts of chlorophyll.

  • Leaves have an enhanced protective barrier (thicker leaf surface with dense leaf hairs).

  • Reduce water loss through transpiration.

Slower Growing Trees

It is a common misconception that a tree that grows faster is healthier than a slower growing tree. Too many people’s surprise, a slower growing tree will outlive a tree that grows faster, especially in an urban environment where space to grow and nutrients are limited.

Tree Growth Regulator


We were very sad to see our huge Maple go, but we couldn’t have asked for a better company to do the job. Everyone at Parshall was professional, courteous…and the guy who did the tree work knew exactly what he was doing. AA+++…highly recommend!

Cindy Franseen, Homeowner

The Parshall crew’s display was very professional, safe and acrobatic, as they climbed and fell a mature 80 ft. oak tree, some of which hung over our second-story roof. Also, they didn’t crush any of the rhododendrons beneath the tree, were very friendly, courteous, and did a great job cleaning up.

Steven Stinson, Homeowner

We recommend Parshall Tree Care Experts to all of our landscaping clients and work with them to maintain our own (beloved) huge, old maple trees. Fast, reliable, professional & knowledgeable. Your trees will thank you!

Julie Sitzema, Landscaper


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