I too was at the Sydney 38th Worldwide Sketchcrawl in the Botanic Gardens. I'm sketching in a handmade book of toned grounds. I had to choose whether to work consecutively as I usually do, or whether to choose the ground for the subject.
It had been 46.4C degrees the previous day (that's 115) and the Gardens were looking a little more ochre than green as they usually are, so I chose those colours for the background. Luckily it was much cooler and cloudy, so we went first to the succulent garden where it usually gets very hot, very early. I felt like drawing something hard edged after that, so we went to the statue. And finally we went to a stand of bamboo where we could sit in the shade (sun out by then).
The other two sketches are from another visit to the Botanic Gardens the previous week. I was still finishing my previous sketchbook then, and playing with selective colour. We got eaten alive by mozzies while sketching the spiral ginger, then we moved on to a spot near Twin Ponds to draw this little woodland area with paperbark trees.