>Under our Wallnut trees (Juglans regia) I find there is no moss growing
>amongst the cobbles until outside the leaf-drip zone where a healthy carp=
>et
>of moss has grown.
>Is this a well known fact, if so what is the explanation. Otherwise, wha=
>t
>do you think? Are there inhibitory chemicals in the water dripping off
>SOME leaves?
Some plants excrete inhibitory chemicals into the soil around them, in an
attempt to reduce competition. Walnuts are famous for this. This phenomenon
is termed allelopathy.
Monique Reed
Texas A&M
