The Landscape Down Under
One cannot help but notice what Colorado landscapes look like this fall. Low relative humidity, wind, high temperatures, and the lack of precipitation have left landscapes scorched. On the plus side, mountain aspen viewing has been spectacular. But right now the state is tinder dry – including some landscapes.
Some folks have given into despair leaving their lawns dry. It is easy to fixate on the brown foliage and turn our attention to the next growing season. However, plant material that goes into winter dry this fall, will only incur more stress next year. The concern for this is the landscape down under – the roots.
Roots are invisible to us unless they surface. Right now as trees and shrubs are preparing for winter dormancy, complex sugars produced during the growing season are directed to the roots, encouraging growth as soil temperatures cool.
Water and nutrient absorbing roots are more important in Colorado landscapes than in most other parts of the country. We have low humidity and infrequent precipitation. The roots must work especially hard to supply the plant with enough water to function. When this does not happen, we have the familiar scorched landscapes.
Healthy roots also help plants ward off insect and disease pests. For example, pine trees may defend themselves initially by “pitching out” mountain pine beetle. Aspen will have fewer and smaller cankers. Lawns with good root systems can defend against necrotic ring spot.
So what should you do this fall?
El Nina is moving into the west and long term outlooks for October call for low precipitation and higher than normal temperatures – or more of the same. Last year was the exception; typically October is a quiet month in the weather department.
If you do nothing else in the landscape, continue to water throughout October. This may mean pulling some hose after your sprinkler system is shut down for the season. You may water less frequently, but once the lawn looks dry – its time to water.
With roots growing, fertilization is in order. Plants are particularly receptive to fertilization this time of year.
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