You hear these terms – “the dead of winter” and “dead to the world”, but what do they really mean?  In most cases, they’re exaggerations or synonyms for other situations; in this case, really cold weather with no end in sight and really, really tired.

In the plant world, the question of “is this plant dead?” comes up quite frequently, especially in winter, and especially with broadleaf evergreens such as arborvitae, yews, holly, boxwood and Oregon hollygrape.

When a tree fails, it is sometimes difficult to determine the cause.  In many cases, it is due to a failure to spread the roots out in the planting hole or simply planting it too deeply.  Doing so leads to girdling or lack of an adequate amount of oxygen, resulting in death.  Other than the correct planting procedure, lack of good follow-up care is the next most common cause.  Each is very important in ensuring a successful planting.  Just like planting errors, many follow-up procedures can be done improperly or forgotten altogether.

The excess rain this year is a change from many years where we are already worried about drought stress on our landscapes. However, excess moisture is causing problems in our landscapes this year from fungal diseases as well as nutrient deficiencies.

Chlorosis

Water is essential to life and has no substitute; hence, water-wise practices that conserve and protect water resources are something we all need to use. 

During the growing season, it is estimated 40 percent or more of water use is for landscape irrigation. In many cases, the water used for this purpose is water that has been treated to drinking water standards. Plants do not need drinking quality water like we do.

Water conservation is important in home and business landscapes. While leaving automatic irrigation systems turned off, and only turning them on when plants need water, is a much needed practice change in many residential and business landscapes, selecting drought tolerant plants is also important.

This article focuses on drought tolerant shrubs for different functions. While listed as drought tolerant, keep in mind plants need established roots to develop tolerance to dry sites. It is often a deep or extensive root system that makes a plant drought tolerant.