Q.Help Save My Dieffenbachia
I just picked up a very very depressed looking dieffenbachia plant on clearance from Bunnings hoping that I might be able to save him! He is incredibly floppy and droopy, trunk looks good but the leaves are NOT happy. There is a new leaf unfurling which doesn’t look too unhealthy. The soil feels very moist so I will be avoiding watering for a while. What should I do to give him the best shot possible?

Certified GKH Gardening Expert
That is very disease ridden. A fungicide may help, but it is very likely that the plant will not survive.
The best way forward will be to use a fungicide and provide proper care. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/houseplants/dumb-cane/growing-dumbcane-dieffenbachia.htm