It is interesting to note that reduced day light induces the poinsettia into bloom. So of course in the northern hemisphere, as Christmas approaches, days get shorter and the poinsettia blooms (I have heard that to induce flowering out of season that you put it in a cupboard after 4-5 hours of light a day for 2 months. Remember, things such as street or car lights will affect its ability to bloom). Yet here in the southern hemisphere, days shorten about now, and the plant is in bloom during June and July.
The poinsettia is reputed to be very easily propagated, and the process is similar to that of propagating frangipanis (dry the cutting for a few days before planting in well-drained soil in the warmer months). The plant exudes a sticky yellow sap when broken (as with most euphorbias) so care is needed when handling it.
More locally, the poinsettia was chosen as the floral emblem of Brisbane when the city was formally formed in 1925. A subtropical climate, the plant thrives there. Here in Sydney the plant also does exceptionally well, but again is usually only seen in older inner city areas - it can't handle the more extreme temperatures of the Western suburbs.