And I mean clay, virtually no top soil.

What ever you would like to grow! My current technique is to start them
in pots and when they are established I use a bulb planter thing which
removes a core of clay. I then pop the plan out of the pot and in to
the new hole. Looks to work OK. Well the plant seems to do nothing for
a week or two (probably devising a strategy for penetrating the clay)
and then it starts to grow again.


Mike