Thanks for posting this Laurence London.
I have asked the Danish Designer of these systems how do they "stop
the Willow roots from clogging up the "spreading system"?
His response is below and may be of interest.
Laurence Gaffney
Hi Laurence
Thank you for your interest of the willow systems that I have
developed in 1996. Your question is difficult to explain short. But
they do not clog spreading system if the system is dimensioned very
exact, the right system for spreading is used and the rigtht cover of
the system is used. And they do not penetrate the membrane egihter.
It is a question of balance between water amount and nutrients more
or less. If the willow have enough water and enough nutrients and
they are cut down in correct cycle the growth of roots are very
limited. Only roots this as sewing treat is developed.
Best regards
Peder
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