I was wondering about one of the method's advantage would be to place WS containers near the spot chosen for future planting in the shade garden. Then in summer the broadleaved trees will cast their dappled shade keeping the ongoing germination cool. The three C's are from Mediterranean climates so I expect that they should need a rest from dampness in summer, which would me in my case.I chose these species because of my simmilarity in climate. So they are sort of minigreenhouses with the seeds doing their job but unmixed with the rest of garden plants growing next and thus easier to asess the success/failure. Instead of using milkjugs ( which for some unknown reason they have not reached us ( milk is sold in cartons or polythene sachet bags) I'll use discarded soft drink bottles which can be camouflaged much better in my future shade garden. I'm assuming that there should be no major difference in doing that. Thanks again Neill for helping me out ; I'll keep posted about it, although as you say it may take perhaps 2 years... by then this thread may be dead!
