Rubber tree sparseness

Hi!, Linda from Toronto here! My 7 yr old Rubber, is becoming quite sparce.
New growth is not happening on the stalks. Lots of little ones @ the base though. Can I knick the stalk @ the area the last leaf fell, even if has been 6 months since the...

leaf fell off? Can I make a lot of knicks down a stalk @ the same time, or should I just cut the whole thing back? If so, what is the best time to do this?
Cheers!

You can do it any time - prune about a third of the plant's branches - cut just above leaf joints. This will redirect the growth and dont worry how it looks, in a few weeks you'll notice a lot more shoots. And wear gloves in case the sap irritates your skin...