Melbourne East – At what point do you give up on a tree?

At what point should I give up on my trees and rip them out and try again?

I’ve got two Japanese maples that I threw in the ground at the last minute as they were overgrowing their pots before going on holiday for a month.

It’s been a hot month, and the leaves are all brown & dead.  Sure.
But the trunks are still green.

Should I yoink them out and try again?  Or leave them in and hope they bounce back with some heavy watering?