Hi I'm new to the forum and I would like you ask a question. I received my serissa bonsai tree 3 days ago. the leaves were all green and healthy; however, last night I watered her a little bit because the soil was some what dry. now this morning to my surprise some of the leaves turned yellow. at first I thought it was because of the sun but I have read somewhere online that I might have over watered it. was it the sun or water?
This is kind of a common problem with serissa. Check out[url=https://www.helpfulgardener.com/forum/viewtopic.php?t=24165&highlight=serissa]this[/url]post because this person had the same problem.
I would get it to a shady spot, and water it using the chopstick method described in [url=https://www.helpfulgardener.com/forum/viewtopic.php?t=1479]this[/url] post. Also, what kind of soil is your tree potted in?