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Originally Posted by SouthPark
I live in North East Queensland. I haven't got any prickly or spiky cactus plants. I think I might give prickly pear or one of those round ball cactus a try!!! I'll do my best anyway haha.
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No prickly pears! You know what they did to your country!
Your climate is very similar to the parts of Brazil with Pilosocereus, Coleocephalocereus and Discocactus (not Disocactus, which are Central American epiphytes.) The first two genera grow on exposed black rock domes, in full sun all day, in tiny pockets of gravel and organic matter. I asked locals about summer weather; they told me it is often 130 F / 55C in the shade during the day. It rains every day in summer, and is dry the rest of the year. Discocactus grow in deep quartzite sand. Most are shaded by grass in the wet summer, but exposed to sun in the dry winter.
But you should be able to grow most other cacti outside, except perhaps high-altitude Andean cacti.
The various epiphytic cacti that tolerate warmer temperatures would also do well for you, but I would worry about birds spreading the seeds and the plants becoming invasive. They don't experience a long dry spell in habitat like you get, so seedlings might not be able to establish.