Black bark on coral bark Japanese maple

Question

Bark turned black from pink and tree died within 6 months.

Answer 1

This may be a disease, which is difficult to diagnose. You may want to discuss the matter with a certified arborist, or with your local Cooperative Extension Office. (https://www.gardeningknowhow.com/extension-search/)

This information about Japanese maple diseases may help: https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm

http://maple.dnr.cornell.edu/pubs/diseases/bark.htm