UKTC Archive

Re: Root Directors (not root barriers) - Observations please

Subject: Re: Root Directors (not root barriers) - Observations please
From: Wayne Tyson
Date: Apr 16 2018 08:07:00
Just for starters, such devices have the potential, and perhaps actually
do, interfere with the development of of a strong, normal root system that
includes resisting tipping forces, obtains nutrients (usually from fairly
near the surface where plenty of oxygen is available for respiration), and
anchors the tree both deeply and laterally. If this diagram is intended to
sell this device, it has the opposite effect on me. The pivot point is
moved down, but it still frustrates the development of roots that can
provide good lateral support.

An alternative might be to use core borings in a radial pattern to direct
the roots below the pavement but still near enough to the surface for
efficient gas exchange and absorption of nutrients where most of the
microbiome is concentrated.




Of course, planting trees in confined, paved spaces is not a good idea in
the first place.

I look forward to your report on the installations you have made.

Wayne

On Sun, Apr 15, 2018 at 8:47 PM, Tim Errington <Tim.Errington@xxxxx.govt.nz>
wrote:

Hello all.

Just a quickie, does anyone have any observations or direct long term
experience of trees planted inside root directors. I am currently
specifying them for use when planting road side trees in new developments
as I'm hoping to avoid the mass of large surface roots that can sometimes
form directly around the basal main stem and result in the usual lifting of
pavements, kerbing and tamac.

I specified root directors while organising tree planting in the UK, but
have not be able to return to assess their effectiveness.

Regards, Tim


Tim Errington  |  Arboricultural Officer  |  Community Services
Queenstown Lakes District Council
Phone: +64 3 450 1715  |  Mobile: 021 1XX XXXX
E: tim.errington@xxxxx.govt.nz<mailto:tim.errington@xxxxx.govt.nz>

P  Please consider the environment before printing this e-mail


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