Instance of several geometries

[TeoAvignon]

Let's imagine I have a tree which is combination of a trunk and the leaves. We could represents it very simply with a box geometry and a sphere on it. I would like to instanciate this tree (something like 100,000 times).

Please could you tell me how to proceed?

I can easily create Instanced with a Box, but I do not know how to add the Sphere above it.
Btw, I could like to be able to manage independantly the trunk and the leaves according to each instance.