I had started pushing the native mint back a wee bit to make way for some kangaroo paws and correas, but then it just died right back all by itself in the heat. It has almost all died, in fact. Even though it looks really feral, cutting it back will prompt it to start growing again, and then die again in the next heat wave.
Native mint before...
...native mint after
We lost our oregano, but the parsley and thyme survived, although is looking a little spindly. Our regular mint pot is looking fine though, although a bit burnt at the bottom.
Regular mint, looking happy as ever.
However, there are two plants that didn't bat an eyelid during this weather (although not veggies):
The ptilotus spathulatus, a perennial shrub native to Melbourne's western planes, and the asterolasia phebalioides, a rare native found in highly exposed, rocky/swampy areas of the Grampians. I bought another one and decided to see how it would go in the ground rather than potted. In fact, these plants thrived in the 40+ weather. I bought a second ptilotus (my first one is in a pot, see below) and royally cocked up planting it: I completely mashed the roots and it didn't get much watering, and two days after planting it was when the real heat wave hit. It dropped a few leaves, but then bounced right back within days. In a pot or in the ground, this plant is indestructible.