Have you checked for fungus Kyushu. It is not normal for purple leaf plums to drop leaves when it is hot. So something is going on and if you thought it was heat stress it does not sound like it was cold!
Fungus is a slippery little bugger. It could start on trees that are tapping into water reserves that you don't realise are gone from the drought and then when the rain comes heavy and constant it makes perfect conditions to attack the weaker trees and then if there are enough spores around it will then effect the stronger trees.
Also once a tree has a fungus it has it for life and can lay dormant until conditions are right agian.
The willow can go yellow from lack of water. With plenty of rain this would not be affecting the willows growing happily in the ground.
I just checked to see if the leaves left still had the fungus and took a pic of one of the worst affected still on the tree.
fun.jpg
Now I may be wrong that the fungus caused the purple leaf plums to drop their leaves and have not checked the other trees in my area for the fungus. Only that I noticed the tree had a fungus and then it dropped HEAPS of leaves mid Summer and it has never done this before so I gathered that was the reason. Now I wonder if the same thing has been happening to my Robina the last few years?
Hey Bodi
It sure looks well cared for so I thought you might say that
![Tounge :tounge:](./images/smilies/tounge2.gif)
But if you could humour me a little more and if you get a chance inspect the substrate to see how compacted the root ball is and also have a close look under the leaves for any fungus. I have noticed various trees in the past have leaves that turn colour on the interior through the growing season and always figured it was because the tree was lacking in some way but it has always been on less cared for stock so I have never fully investigated.
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It's too bad your in such a hurry cause the stories I could tell you, Bushels and baskets of stories, hole crates full of stories. But if you can spare a moment I will tell you one story.