Trees, potted plants and other vegetation

Hello everyone,

I am looking for a little direction for creating/modeling/faking the items mentioned in the subject title.

I have used the L-system to create trees, and plant studio for some simple flowers (export and import via vrml), as well as Blenders particles for grass. I am thinking of modeling a scene similar to the link below, and was wondering what techniques other people would use to create the various plants and trees.

The image:

As always, thank you for your time!!!