If you have been watering like that recently, you are probably giving too much water, since it has been cool and rainy. It probably didn't much like the cold temperatures either. They grow when warm, die easily when cold. Feed and water when warm to encourage growth. Water more lightly when cold to prevent rot. Feed lightly, they do fine without heavy feeding. Good luck.

Thank you. I will reduce watering and feeding to see if it gets any better. I will let you know couple months from now. Thanks again.

I agree with ketvalgal. You don't want to water that much or feed during winter. Its best to kind of keep tropicals in a dormant state until the weather warms up. What kind of temps are you getting over there? Do you have any pictures? My jambus here are barely showing signs of pushing new growth.

hi eggo,
the temp is is averaging 50-55. sometime go down to 48 which is the lowest. I will take some pixs soon. The same here , my jambu looks dead with couple leaves left and turning yellow to brown..:-(( .. I don't know what to do, just hope that it will recover when the weather gets warmer. i stop watering for almost a week now. This morning, I checked the dirt at the bottom of tree and it was still damp...

Feed some iron rich fertilzer to stimulate the roots and Phosphate rich fertilizer just before flowering time to help flowering and fruiting process.
If the over all growth of the plant is not healthy, feed balanced fertilizer ( like 10-10-10 NPK ) as per instructions of the manufacturer. This will provide some help.

Thank you Chaman. I will visit HomeDepot tomorrow to buy the fertilzer as you suggested. Any brand name in particular? I will let you know next month the progress.
Thanks again

Fruitlover my lows for the month of march has been anywhere from 44-54. Even dropped down to 39F once. The jambu hasn't defoliate but its under the protection of the patio. Wait until you see some new growth and then start your regular routine like before. Just make sure the soil is moist not wet.