[jhoechtl]

> Furthermore, trees need organic material. A lot of it. A tree planted in "dirt" will be about the same size 3 years later.

As someone who has a green thumb, was fascinated of trees since a kid and is working a considerable amount of forrest partly with his own tools: It's not like that.

There are trees which fall into the category of early succession. They shy away of compost, their seeds do not even germinate in such an environment. They need bare soil.

Other trees prefer poor soil as they perform symbiosis with fungi (mykhoriza), essentially producing the type of soil they need (partly).

And then there are the trees which prefer rich soil.

The later category are trees where the lawn owner is to impatient to wait (how can I make my tree grow faster) or the aggroforrestry is dependent on highest yield in shortest growth time.