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Estimating the “Zone of Upheaval”

Posted on 12 March 2015 in Planting/Establishment

As a tree grows the base of the stem expands (trunk flare) and the diameter of the primary roots increases, particularly close to the base of the stem. These two phenomena can result in the generation of extreme forces in an area around the tree known as the “Zone of Upheaval”.... Keep reading

Our Best Urban Native Tree

Posted on 12 March 2015 in Urban Forest Generally

When you are next driving through an established part of Sydney, Melbourne, Newcastle, or any of our other major eastern centres (particularly just after a storm), look around you and note the trees that look to be the healthiest, the bushiest and make the greatest positive contribution to the urban landscape.... Keep reading

Understanding the concept of “size index” - calculating the physical size of trees

Posted on 24 October 2014 in

The concept of "size index", needs to be understood by all tree growers and users. As a measure of a tree's physical size, size index was an important concept In the NATSPEC specification and has continuing importance under the comparatively new Australian standard AS 2303 - to determine whether a tree is appropriately sized for its container and to enable a quick comparison between trees being offered by competing suppliers. ... Keep reading

Buying big landscape trees – are you paying too much?

Posted on 24 October 2014 in

How do you compare different prices for what is, allegedly, “the same sized tree”? Is pricing based on container size fair? Is pricing by tree size more fair? What is “pricing by size”? Can “pricing by size” save you money?... Keep reading

Not dead – just disappointing

Posted on 7 July 2014 in Root Systems

At Trees Impact we persistently push the ‘quality’ message. But preach as much as we like, decision-makers actually need to see what we are talking about to appreciate that message. So…... Keep reading

It’s all in the roots!

Posted on 27 March 2014 in Root Systems

Beware of container-grown trees? Well, be alert but not alarmed. When trees with girdled roots are planted the visual, environmental and social benefits are all compromised.... Keep reading

Beware - The Perils of Staking Landscape Trees

Posted on 21 January 2014 in General Quality Issues

If trees don't need to support themselves, they won't. So they develop a dependency on the support provided by the stake, fail to develop the strength needed to hold themselves upright and collapse when the support is taken away. Sometimes this can be corrected with good management over time but, all too often, the trees are doomed.... Keep reading

New Plantings - Early Watering Needs; Plus the Impact of Rain

Posted on 29 October 2013 in Planting/Establishment

There are a couple of widespread misunderstandings in our industry regarding the water needs of newly-planted trees. Sadly, these misunderstandings can greatly impact on the successful establishement of otherwise thriving trees... Keep reading

Are we too pernickety about our urban trees?

Posted on 29 October 2013 in Urban Forest Generally

It has been suggested to us by some growers that the standard for trees set by the NATSPEC specification is too high and that trees really don’t need to be that good. ... Keep reading

Rootballs on Show - A Look Below the Surface

Posted on 28 July 2013 in Root Systems

Following a series of slides showing rootballs of some Trees Impact stock one delegate made the comment “I have never seen rootballs as good as that and doubt anyone else here has either”. ... Keep reading