Foliage geometry in top of each other

I am trying to use Foliage to populate my scene with landscaping elements, bushes, flowers, plants etc.
The problem that I have is no matter what value I use when I select more than one geometry to pain it places 2 or more geometry in the same stop in the top of each other.

I can place a single mesh at the time but that defeats the purpose of ‘painting’ your landscaping with this tool.
Your help is appreciated.