UKTC Archive

Re: Treegator irrigation bags

Subject: Re: Treegator irrigation bags
From: Deric Newman
Date: Oct 08 2019 07:48:42
Morning Matt

We use them for trees up to 14cm girth. They do work but there are pros and
cons

*Pros*
Easy to fit - efficient and hard to get wrong
Easy to use - 5 minutes to fill, every tree gets the right amount (with the
best will in the world an operative is not going to water every tree the
same amount
Maintenance free - won't get filled with detritus like a pipe can

On an overnight shift with 1 man and a transit carrying 950 litres a time
we were watering 60 street trees in 8 hours (the time of day is a factor
here too, much quieter on the roads also good access to watering point to
refill IBC bowser)

*Cons*
As you say the watering 'footprint' is very small, it only really waters
directly beneath the bag with very little spread. This will not encourage
lateral root development out of the rootball.
Bags must not be tight on the stems as this can lead to rubbing and rotting
of the timber inside that created microclimate against the stem (these are
the two reasons we only go up to 14cm girth with them)
Have to check bags are working, we got a dodgy batch once and it was only
on the next visit that we discovered bags not emptying
Have heard reports of damage to the bags from rodents
Bags have to be removed, possibly they could be reused (see point above
about checking they are working)

*Summary*
Don't use the bags only, specify that water is also applied to the tree pit
surface at each visit.
In an ideal world would use in combination with a standard irrigation pipe
encircling the rootball just below ground level and both would get watered
during a visit.
Alternatively consider using a rigid plastic ring installed at the edge of
the rootball and extending 75mm above soil level to act as a dam. The
watering operative can then fill this dam to capacity (relatively quick and
a measured amount for each tree) and this water will soak in over the whole
root ball area.

Regards

Deric



On Mon, 7 Oct 2019, 18:16 Vernon, Matt, <matt.vernon@xxxxxxxxxxxx.gov.uk>
wrote:

Hi Everyone,

Apologies if this question has already been asked.

I was wondering if anyone has any experience of whether the treegator
watering bag is effective, and if establishment is any better? My concern
would be a relatively small area, mostly around the root collar, only being
watered, and that the cost benefit ratio is actually worthwhile?

Any real world experience would be appreciated!

Regards

Matt

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