Trees have a yearly cycle. They lose water all winter long. Calgary is hard on our trees, being in the heart of chinook country.
As soon as the frost leaves the ground you should start watering 1 -2 inches every 2 weeks. If you do not have a rain gauge try using a measuring cup to find out how long it takes to water. Do not forget to measure the rain and then water or skip accordingly.
If possible direct the water from your down spout to the trees. No sense in wasting water.
In Calgary you should water until the first week in October. Then give the trees a good “soaking” to get ready for winter. Probably twice what you normally water. Then leave the trees alone. Let them get ready for winter. It is important not to water after mid October. It may cause damage to the trees. They need time to adjust to the climate changes and get ready for their dormancy.
There is no sense to watering in the winter. The ground is frozen and any water will just stay on the surface and freeze. The roots will never get any of the water even with the Chinooks. It is better to wait for spring and all the frost is out of the ground. That way you will not “fool” your trees into thinking spring has come too early.
It is best to water your trees with a heavy, long single soak. This way the grass will get it’s water and the rest of the water will go below the grass roots to the roots of the tree.
The best time to water is early morning or late at night. If that is not possible it is still important to water especially if the temperature is in the high 20’s or 30’s.
Even though Calgary’s climate is dry and we have a lot of clay in our soil, it is still possible to drown the trees.
The most important part of tree care is watering. As with most plants watering too much or too little causes 80% of tree related problems.
When planting new trees let them sit for 48 hours after planting before watering. This will allow the tips of the fine root hairs to harden before being submerged in water. When you start to water, make sure to keep the tree well watered depending on the specific soil you have.
Your trees need more water than the grass. Every couple of weeks when you are out working in your garden or just enjoying the patio area, let the hose trickle into the tree wells. If you water deeply and infrequently you will promote deep root growth. This makes for healthier more drought – resistant trees.
During mid September to mid October you can harden off the more mature trees by watering them sparingly. Late October give them a good soaking just before you are ready to shut off your outside taps.
During the winter you can keep throwing snow over the roots and around the base of the trees.
New trees should not be pruned for a couple of years. Fertilizing is good for the first few years. Spikes are not recommended. They do not break down uniformly, and may burn the fine root hairs where they are inserted. Mulching is important. Put a layer of mulch around your new tree. Wood-chip bark is best. Mulch holds in moisture, slows weed growth, keeps soil temperature even. Helps to keep the grass from growing around the base of tree, adds organic matter to your soil, and helps stop surface roots from being exposed when first watered. Use about 4-5 inches of mulch.