Hello! I have a potted Japanese Maple that I got in April. It has seemed very lush and happy until this week when I noticed some of the leaves had turned brown and shriveled and some others had turned from bright green to yellow/pinkish. It receives morning light from about 9:30am to 1:30pm. I have not been watering the tree regularly because it seemed happy collecting just rainwater and I didn't want to upset a good thing. Now I am worried it may be underwatered. I want to do the right thing but don't want to water more if improper drainage is the issue. Thank you so much, I love this tree.