How much water do they need?
Certified GKH Gardening Expert
This will only need watered when the top two inches of soil are almost completely dry. This will avoid any fungal infection and ensure that it remains moist enough, but not dry or wet.
This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/trees/smoke-tree/growing-smoke-trees.htm