Reducing pruning with tree growth regulators

As part of our vegetation management efforts, selected trees may be treated with Tree Growth Regulators (TGRs). TGR compounds control the growth of a tree's crown. The tree's branches grow more slowly, so the tree requires less pruning in the future.

Advantages of TGR
TGR treatment offers advantages over pruning alone. Each new pruning places a tree under stress because it removes leaves and branches, which produce nutrients. In response, the tree taps its reserves to grow new wood and leaves. But TGRs control the re-growth response, so the tree keeps its reserves available for fighting disease, insect attacks and environmental assaults like drought and pollution.

How TGR works
TGRs don't stop tree growth; they only slow it down. The horticultural industry has used TGRs since the 1960s to produce more compact and attractive plants. Generally, the leaves of treated trees have a more dense appearance and a darker green color. The tree looks healthier and thicker. Of course, tree appearance will vary with tree species and environmental conditions.

TGR treatments are effective for two to eight years after application depending on tree species, environment, application rates and seasonal timing. TGRs do not affect other natural processes, so treated trees require no special care. In fact, research indicates treated trees may hold up better under drought and disease stress.

TGR compounds pose no adverse effects to humans, animals or the environment. Only trained professionals, using proven methods, are permitted to apply TGRs. Direct contact with yourself, a child or a pet is unlikely. Trees that bear fruit or nuts are not treated. Other by-products of treated trees are safe to use. When the leaves or wood of a treated tree is burned, the compound breaks down into harmless elements. Leaves can be used for mulch around trees, shrubs, flowerbeds and gardens. TGRs may affect surrounding grass and shrubs depending on the compound and application method used. However, such effects are often subtle and temporary, resulting in no permanent damage.

The soil injection process applies TGR compound into the soil around the tree's base. During active growth, the compound is absorbed by the tree's roots. From there, the compound is naturally carried into the tree's stems.

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