Serrisa foetida help
When my father returned to the university of michigan's greenhouse/matthaei's botanical garden, he not only returned with the plant he was originally gonna nab me, but also a serissa foetida (they also called it chinese snow rose). There seems to be some confusion about the names with this plant. Tree of a thousand stars = numerous small tubular single blooms + smaller leaves. Chinese snow rose = larger doubled blooms, less in number and larger leaves. Is that correct? Mine is the one with tubular, white, single flowers. I don't want advice for the wrong plant. Although a popular bonsai, i'd rather have it grow into a larger houseplant, hence this is not posted on bonsai forums.
Anyway, i don't think i have a great place in the house for it and some of the leaves are yellowing/falling off. 80%-85 percent of it's leaves still remain. There are good sized windows but the awnings and trees on the outside take a lot of light away. It is only 5" tall, potted in well draining medium. I water it when the top of the soil is dry to the touch (and a little dry a centimer further down). It is placed in front of a window facing southwest, but again, the awning and tree takes most of the light. It gets about 1hour 30 minutes of direct sun a day, medium/bright light the rest of the day. Sadly this spot also tends to get drafty due to the vent a couple feet away and a small heppa filter on the other side of the room, roughly 8' away. I also noticed that the air very close to the window is too cool (i live in northwest ohio). I have never fertilized and water with lukewarm tapwater. I researched the care it needs, but i thought i was pretty close to it. The plant is too fickle for a novice like me to get, but since my dad took the liberty of getting me one, i would like to keep it. Wish i could post a picture, but i currently have no camera, might get a picture later. Hopefully i supplied enough details.
Could anyone tell me what is wrong?