Gardens Galore: Tree Whisperers ~ By Karen Brewka

After the fierce windstorm at the end of November, many people are wondering just how safe their trees are. The International Society of Arboriculture and certified arborists all over the world work very hard to learn how to assess the potential hazard a tree might hold.
An inspection will assess the potential for failure and includes an analysis of tree health, site conditions and tree defects. For example, an older tree might have some damage or disease that might indicate a potential for dropping branches or whole tree failure. Trees that have been topped grow a bunch of branches at the cut that have no normal connections to the trunk. These branches often fall whether it's windy or not. Also, rot usually takes place where the trunk has been cut, speeding the hollowing of the trunk.
Mature trees that have had their roots paved over, dug into or damaged in any way lose support strength and can easily be toppled in a storm. Many of the toppled trees shown on news programs after storms have minimal root masses and the pavement is evident right there beside them. Trees with co-dominant stems and incurved bark can split.
Another element of the inspection includes target assessment. If the tree fails, what kind of damage can it do? Could it fall on people, cars, houses, utility lines or would it cause very little damage if it drops branches or topples?
Sometimes there is no rhyme nor reason for a tree to fail. The wind can torque the tree to the point where it cannot withstand the pressure. I've seen old poplar snags standing after a windstorm while, nearby, a younger, healthier tree has dropped a big branch, smashing a picnic table.
Trees are living systems. Experience helps in assessing potential for damage but many certified arborists also have a knack for sensing if a tree is stressed or sound. I call these people 'tree whisperers' and we are fortunate to have three of them in our area; One in Black Diamond, one in Okotoks and one in High River. If you are concerned, call them up and arrange for an assessment. They'll help you figure out how to improve tree health and minimize potential damage. If you hire someone to do some work, make sure they're certified for the type of tree work you need.
Winter is a good time for an assessment. The structure of the tree is easier to see when the leaves are off and if any pruning needs to be done, now's the time.
The Valley Neighbours Garden Club meets on the second Thursday of each month at Valley Neighbours on Sunset Boulevard in Turner Valley. The club welcomes new members. For information call Bea at 403–933-7131. The Horticultural Club meets every second Tuesday of the month at 7:30pm. For information call Sheila at 403–931–3989.