Hi Nick, you have asked the wrong person, i have never attempted these

{{gwi:173639}}

So i referred your post to an expert who replied....
Arthur , he could put them in the crisper in the fridge for a couple of months or plant them in a shady spot in a mix incorporating some barely moist sphagnum moss. More important to keep the tubers cool, the leaves are more tolerant to summer heat (L.A. is the same latitude as Sydney) Most Ptst. love to be crowded,but only barely moist till the rosettes have appeared.

But then i thought maybe you could grow some or all of them in your cool house (but that doesn't get you over them problem of getting them in sync). Not sure how long from the first growth to flowering but it would be nice to see a few blooms.

These are probably the widest grown and easiest of all the Australian Native Terrestrials to grow. I looked up the local OS Database and most are exhibited
in August.
Sydney weather in August 2010...
Temps
Min Max
9.5 18.3 mean
6.4 15.0 lows
12.8 24.6 high.

Here is a link that might be useful: Nesbitt's notes

Thank you for the advice. I have read Nesbitt's comments before, very helpful.

What I will do is split the tubers I have, half will sit in complete shade under a tree and the north side of the house and receive next to no water until I see green. The other half will sit in the cold house and wait there for sprouting. I also have one tuber each of curta x nutans, obtusa and Ptero x furcillata sitting in the cold house waiting for the tooth fairy.

Hope some of them will do something.

Nick