We just bought a house with a Chinese / Japanese Parasol tree (Firminia Simplex) tree next to our drive way in the alley. It had beautiful green leaves until about a week ago and all of a sudden the leaves turned brown almost overnight and have been falling. I have read that these trees thrive in areas with poor drainage. We had the grade of the soil lowered near that tree because of the inadequate drainage that was causing other problems. Im wondering if that is what made the leaves start to fall.

Does anyone know...Is there a way to "bring it back" by watering or using the sick tree treatment? WHen do you know its time to just have it cut down?

It's time to have it cut down when it's well and truly dead.

Until then I'd say it was in shock form the grade change and that the Sick Tree Treatment would probably be a good idea.

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Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.