I have a hibiscus. It grew well in summer while I put it on the belcony. By mid Spet I moved it into the room infront of the padio door( facing south-west). The sunshine is about 6-8 hours a day(except the raining days), room temp is 18-20. by the mid of Oct. it sharted to have yellow leaves, while there are still some new leaves growing out. these few days there are more leaves getting yellow and fell. I water it when I tried with finger when the soil is dry (about 1-1.5 inch under). It is about 185 CM high and about 1.2 meters wide. now there is about half leaves left:( Is there any suggestion I can have fro you people? Thank you.
This site might help you determine what's wrong, and what you can do to correct it. http://hibiscus-sinensis.com/hibiscus/care.html