Info for Homeowners

Frequently Asked Questions

When should I apply Cambistat relative to pruning?
Depending on the desired results:
* For optimum growth control, Cambistat should be applied 60 – 90 days prior to pruning while the tree is actively growing.
* For a more natural look, apply Cambistat at the time of pruning or up to 30 days after pruning.

What is the best time of year to apply Cambistat?
Cambistat can be applied anytime during the year as long as the ground is not frozen or saturated with water.

Will surrounding vegetation be regulated?  
Yes.   The growth of grass, shrubs, flowers, and other vegetation will be slowed if the roots of these plants come in contact with the applied Cambistat.

Will use of Cambistat replace pruning?
No.  Use of TGRs reduces shoot growth which reduces frequency of pruning.  If a strict cycle is maintained, Cambistat will reduce the amount of vegetative growth necessary to remove.

How long does Cambistat last?
Reapplication is recommended every 3 years.  However, on some tree species, effective regulation lasts longer, others may be retreated sooner.

What risk does Cambistat pose for people, pets & wildlife?
Cambistat has a CAUTION label.  Cambistat is diluted with 11 parts water and placed in the soil next to the tree by licensed and experienced applicators.  The tree roots absorb Cambistat, and it moves into the canopy which removes it from the soil.

What are the effects of Cambistat in groundwater?
Laboratory and field studies have been conducted as part of the standard battery of toxicological studies for acceptance by the EPA.  It has been concluded that paclobutrazol has low mobility in soil.  In a field study in sandy loam soil in North Carolina, with irrigation of 8.47 inches of water over 30 days, no paclobutrazol was detected below 6 inches of soil.

What is the background of this product – research, field performance?
Paclobutrazol (Cambistat) has been university researched and field tested for over 30 years and has been used in the utility industry in its present formula for more than eight years.  It has proven effective in all parts of the country.

Can I use treated leaves for mulch?
Yes.  Leaves from treated trees can be used as mulch, bagged for disposal or bundled.