You've described our yearly climatic conditions very well. Summers are extremely hot (110F forecast for tomorrow) and dry (haven't seen rain for well over a month) and the winters are cool (without being really cold- never near freezing or snow but the occasional frost) and wet (at least they used to be, we're in a 10 year drought at the moment).
There are actually a number of tuberous Drosera species which occur at about 27 S. The nearest town to this latitude is Kalbarri on the WA coast and this area is home to a number of species confined to this small area. Having never been to Kalbarri I'm not too sure what the weather is like there in winter and whether or not this region has the same tropical conditions that you would experience.
Anyway, here's a list of the species which grow around the Kalbarri region-
D. macrantha ssp. macrantha (northern forms)
D. macrantha ssp. eremaea (same latitude but further inland where winter nights would be very cold)
D. menziesii ssp. thysanosepala
D. neesii ssp. borealis
D. stolonifera ssp. humilis
D. stolonifera ssp. prostrata
D. bulbosa ssp. bulbosa (northern forms)
D. bulbosa ssp. major (similar latitude but further inland)
D. zonaria (a little further south)
and that's about all. There are no species which grow any further north than around 27 S.
These species would probably handle your conditions the best but the unfortunate thing is that these are also some of the more difficult to obtain.
Thank you for all your good advice and for answering all my questions. I should have asked all these questions first but...the seed was offered at a very low price and I decided to give it a go. I will wait until August to sow the seed and in the meantime learn more about this species.
Maybe the cp gods will look favorably on me this fall.
Thank you again Seandew.
Any possibility of these species or any growing in a totally tropical climate? I am thinking of trying to grow some tuberous dews and so far have a tiny D. pelatata seedling (I think). Or is this an impossible mission?
Not impossible, but very difficult if you do not have the ability to keep them cool during the growing season. I haven't heard any reports of collectors trying to grow tuberous Drosera in tropical climates so it is impossible to provide a definitive answer.
Getting back to the D. gigantea for a second. One thing worth mentioning is that in my and other friends collections, D. gigantea is always the last species to begin growth and the last to enter dormancy. This means that much of its growing season is at the end of winter and well into the warmer parts of spring and often into summer. If any species should be able to cope with slightly warmer temps D. gigantea will probably be the one. I still wouldn't be sowing the seed until August though.
I am definitely waiting until August or maybe even the first week of September. The first cool nights usually do not occur until late September or early October. Who knows aybe they will grow and work out. At any rate it will be worth the try.