Crown dieback refers
to the dying of tree branches from the tips towards the trunk, which
is usually caused by root damage. When you see something similar
happening to the tree, you should pay attention to its roots. To
sum up, I think there are four possibilities: 1. The tree itself
has been under pressure for a long time. When a construction
project nearby is launched, the tree may become over-sensitive. 2.
The tree is blown lopsided by strong wing. Roots are out of place
and broken. 3. When the tree is being transplanted, the digging of
earth may damage the root ball. 4. The tree is underplanted with
shrubs or seasonal flowers which forcibly damage the tree roots.
It is Silk Oak (Grevillea robusta) in the
picture which is grown in parks. This is an easy-to-grow species.
Its flowers provide nectar and are of high ecological value.
Absorbing roots are usually within 10 inches in the topsoil and are
vulnerable. It comes to my attention that greening programs in
recent years make use of every inch of space available to grow
plants. Thus, the space around tree foot is always occupied.
The practice of “destruction before construction”
should be discouraged.
*translated by Mary Chung