Q. We are planning on removing our lawn and changing over
to desert landscaping but after reading your blog I am wondering how the old,
large Modesto Ash trees will fare from this change? Do you think it would be an
issue? I tried to find out about their root system, it seems like it is
shallow, but won't that be an issue as the roots will be damaged and then
covered with hot rocks?
See this posting on my blog:
 |
| Large tree suffering die back due to drought after conversion to desert landscaping |
A. I am not telling you not to convert to desert
landscaping but be cognizant that established trees can get hurt in the process
and many landscapers do not know how to convert from lawns to desert
landscaping with existing large trees.
If you have large trees in an
established landscape you have some options.
1. Leave the lawn surrounding the
big trees and remove lawn where there are no big trees.
2. Remove lawn and
spiral in-line drip tubing around the existing trees out to a distance of their
drip line (spread). However, if you do this you should put this drip tubing on
a separate valve and run it longer and less often than drip going to other
plants.
3. Put LOTS of plants beneath these large trees and drip irrigate them
to assist the existing trees with enough water. This is above and beyond having
emitters for the large trees, too.
4. Use a lawn irrigation valve to feed
bubblers to existing trees and form a basin around the trees to capture water
from the bubblers. This is called basin/bubbler irrigation and is a form of
flood or border irrigation. The basins must be level and flat and be three to
four inches thick.
