Q.Coral Bark Maple, leaves turned brown
Our Coral Bark Maple was doing terrific. Went on vacation and now the leaves are all brown. Still green in the branches. I am confused whether it to much water or not enough, any ideas?

Provide well-drained, slightly acidic soil. Water deeply and regularly during the first few growing seasons to establish an extensive root system; reduce frequency once established. Fertilize before new growth begins in spring. Avoid hot and dry sites, and protect from strong winds
You will need to check the soil moisture to determine if your tree is dry or overwatered.
These articles will refresh you on the care information and help with possible issues.
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/coral-bark-japanese-maples.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-problems.htm