Item Brochure

11
1. Soil Amendments: Trees that tend to go into shock when
their root systems are disturbed will recover more rap-
idly by adding the proper soil mix into the root prune
cut on the tree side of the barrier.
2. Pruning of Crown: Pruning of larger roots or pruning
closer to the trunk inevitably impairs anchorage to some
extent, therefore the foliar canopy should be thinned
before roots are pruned to reduce wind resistance.
3. When to Prune: When feasible, root pruning should be
done after the end of local high wind season (where those
occur), or five or six months before onset of seasonal high
winds. When there is a likelihood of excessive wind and/
or rain, risk of post-pruning tree loss is high, and excep-
tional care must be taken in any root pruning operations.
4. Limit of Annual Root Pruning: When root pruning is done
within seven trunk diameters of the tree base, pruning
and DeepRoot Tree Root Guide installation should be
limited to one side per year. For installations on more
than one side there should be an interval of one year
between successive prunings.
5. Minimum distance from Trunk: Follow the table and illus-
trations shown. Root pruning closer than three trunk
diameters from the tree base is not recommended due
to increased injury/infection at pruning site and to
increased danger of treefall from impaired anchorage.
- Note: Because trees and their related root problems vary
considerably, specific guidelines cannot be prescribed.
These guidelines are broad in scope and each tree must be
evaluated individually using sound judgment. Always con-
sult your local ISA Certified Arborist before root pruning.
GENERAL GUIDE FOR MINIMUM DISTANCE
FOR ROOT PRUNING
A
Trunk Caliper Measured
12" (30cm) Above Ground
B
Root Cut Distance
(3X Trunk Caliper)
4" (10cm) 12" (30.5cm)
6" (15cm) 18" (45.5cm)
8" (20.5cm) 24" (61cm)
10" (25.5cm) 30" (76cm)
12" (30.5cm) 36" (91.5cm)
14" (35.5cm) 42" (106.5cm)
16" (40.5cm) 48" (122cm)
18" (45.5cm) 54" (137cm)
20" (51cm) 60" (152.5cm)
T O C A L C U L A T E T h E N U M B E R O F P A N E L S N E E D E D F O R A
ROOT PRUNING APPLICATION:
Estimated diameter of the tree canopy at maturity + 2' (61cm)
= Length of panels per side.
SUGGESTED GUIDELINES
Root Pruning
Root pruning can save a mature tree from being cut down and prevent future damage to hardscapes,
however it must be done cautiously and professionally to ensure success. The following steps are
designed to serve as general guidelines for root pruning. For more detailed information consult with
your local arborist.

DN
%FFQ3PPU#BSSJFS
$BMJQFS
" #