Depth Of Roots - Knowledgebase Question

Nahant, MA
Question by bpiv
September 28, 2004
Hi...I am trying to find out the relative depth of roots when mature of amerlanchier, and other various shrubs as a ratio of shrub height to and width to the depth of its eventual roots . Any help would be appreciated ....Thanks, Bill


Image
Answer from NGA
September 28, 2004

0

The ultimate size of any root mass will depend a great deal on soil type and growing conditions. But, a good rule of thumb is that the roots of most shrubs remain in the top 12-18" of soil and extend out about twice as far as the width of the plant. Since a typical Amelanchier spreads by rhizomes, the root mass will continually expand, which will extend the root system farther out than most other shrubs. As an example, if you were growing Daphne odora, with a mature height of 4' and width of 6', you can expect the roots to extend out 10'-12' from the center of the plant when it is fully mature. An American arborvitae (Thuja), with a columnar growth habit can reach 20' high and yet remain only 2-3' wide. The roots of these plants will grow down about 18" (to anchor the plant), but will extend out only 4-6' from the crown of the plant.

Hope this sheds some light on the root growth of most shrubs.

You must be signed in before you can post questions or answers. Click here to join!

« Return to the Garden Knowledgebase Homepage

Member Login:

Username:

Password:

[ Join now ]

Today's site banner is by joannakat and is called "Two poppies (Icelandic and California)"