Sorry, I still can't find your pictures and without knowing the names of any of your plants or what they look like it's hard to give advice.
But it is autumn there so I was looking up what the weather is like there now, as well as historical weather and climate and daylight hours there in autumn. I suspect if it's only your broadleaved plants that are failing then it's a natural occurrence due to the season. With the decrease of daylight hours less than 12 hours a day nearly all deciduous perrenial plants outdoors start to change colour or brown and drop their leaves in autumn in preparation for winter dormancy - and any annuals seed out and then die. Decrease in temperatures and daylight hours triggers it.
One other thing I noticed is that autumn is typically Gauteng's driest time of year, and right now your UV index is high. That lack of water and humidity and the high UV is something else that can cause plants to go dormant or die off earlier than usual before winter. But that is normal too. If you can find out the names of the plants it might be possible to be more informative.
Is this what your urn plant looked like?
https://www.gardeningknowhow.com/hou...-urn-plant.htm
The link below is the weather link for your area that I was looking at.
https://www.worldweatheronline.com/j...auteng/za.aspx
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