soil for potted ginkgoes

I was wondering what a good soil mix was for ginkgo seedlings I would like to grow in containers. Also, how often would you need to repot them?

 

Something with fairly good drainage (not peat-based)

 

Right, they're not that fussy as long as it's relatively decent. No need for added acid or lime or anything.

 

Ginkgoes are fairly slow growing but even if their growth rate does not require repotting it is a good idea to refresh the soil every couple of years.