In article ,
(Nick Maclaren) wrote:

They are very shallow rooted

EOFL! Under the crown of mine, there are roots clearly destined for
Australia. Some are 1" in diameter and heading straight down.

Try this US site:

http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7434.html

Steve Harris - Cheltenham - Real address steve AT netservs DOT com