So here's some background. About a month ago, I got a 6 ft Ficus Benjamina from a retired lady. She travelled often and when she would leave she would turn her heat way down in the house. This resulted in her ficus losing 1/2 it's leaves. So she gave it to me - in this state - to care for and hopefully revive.
The plant is next to a SW facing window and receives 1-2 hours of direct light and approx 6-8 hrs of indirect (I live in northern Alberta, Canada so light is still sparse and there's still snow on the ground). I've fertilized once with liquid fertilizer. Water approx weekly enough water to drain out the bottom. It never sits in water.
Here is my issue - The tips of the bare branches are green and there are tiny shoots of new growth forming. But once I see them, a few days later they shrivel and turn black. I have then been cutting this off - only the black - as there are new growth shoots further down the branch. Why is this happening? The other half of the tree drops maybe a leaf a day (green healthy leaves)and seems to be ok other than new growth turns black as well. The leaves it has are all green - no yellow - maybe the odd brown tipped leaf. Please see pictures.
Why are the tips and new growth turning black and dying? Should I just cut off all the bare branches and start new? Would the tree be able to survive such a severe haircut?
Any help would be appreciated. I'd love to restore this tree to its former glory!