This is actually a good time to repot too- so consider listening to Lucy's advice. I too think it's probably the radiator.Humidity trays never worked for me but my home is very very dry and the jasmines are actually one of the few plants I have that never complain. But that hot dry air from the radiator can't be nice for any plant! I don't think it's a sun/window issue too much- mine couldn't have gotten more than 2 hrs of sun every afternoon all winter but they flower about 11 months of the year. Also, is your window very drafty? I noticed this winter I couldn't keep any plant by the window- they were turning yellow (I mostly grow tropicals). Strangely, last winter I didn't seem to have this problem. I'd say- repot, move from the radiator and water less often. If you can post a pic, we can see what type you have and better help you.

Sometimes things get confused due to lack of a scientific name. In my case, I speak of trachelospermum jasminoides, which is identified as being both confederate jasmine AND star jasmine. In the south it is referred to frequently as "confederate," and the USDA Plants data base shows it native to the entire states of Lousisiana and Florida, but does not show it as native to Alabama....which I consider as a slap to our southern heritage! :) It is also shown to be hardy to zone 8A at least. I do not think this particular trachelospermum is a true jasmine, it is more likely just a jasmine scented plant, thus they added the "jasminoides" to it, but I'm not a botanist or a horticulturist, so cannot speak for the intent in nomenclature. I would recommend checking on the scientific name of any plant, since anyone may mistakenly call a white blooming 5-petaled scented dark green vine a "star" jasmine because they think that is what it is. But trachelospermum jasminoides, AKA star jasmine, AKA confederate jasmine, is a pretty tough customer, and has endured the last two years of really cold winters here in Mobile (zone 8B) unprotected, although I must admit the plants were mature and huge, and did have a little bit of browning on a few outer leaves. Besides the 100 foot of these planted on my 7 foot tall privacy fence, they are just new last fall and have not grown that much (they take off and GO their second year), I also have these: The massive column of dark green is ONE PLANT of trachelospermum jasminoides, over 8 foot tall and about 4 foot in diameter plus many runners on the ground looking for things to wrap around and climb. It does not attach via platelets like ivy, it just twines and climbs: Here is that plant in full bloom ...ONE plant: And this is what that ONE PLANT looked like in April 2008, I think the 2nd spring after I planted it: after the second year, stand back, because it will be settled into its site and ready to reach for the skies!!

The main flowering season for Confederate Jasmine is spring, and they need some cold temps before blooming, so don't be surprised if you don't see more blooms until spring. However, there's another problem with getting to spring even before dealing with the unhappy plant -- this vine is only hard to z6 at best, and in a pot, it's going to have a tough time surviving the winter at all, especially as a recent transplant. Do you have space to overwinter them indoors, even a cold garage or basement? As for the sad plant, box-store plants often have root problems due to standing around in small pots getting overwatered or neglected by employees who don't really know how to care for them. It's likely that this one is still struggling to put out new roots while it's been blasted with full sun and summer temps. Get it out of full sun and give it just morning sun, keep it moist but not sopping wet, and see if the new growth looks healthier. If not, you may have to turn it gently out of its pot to look at the roots -- brown, rotten roots need to be cut off and then the plant needs repotting with fresh, well-draining potting mix. Hope this helps! Jim

I'm not sure Asiatic Jasmine will work well if you intend to walk on it (see the link below). Nor will Confederate Jasmine. Here is a link that might be useful: Univeersity of Florida Link