Hi, I have a couple of baby olive trees which I have in a plater outdoors. Lots and lots of hot sun but one of them is really struggling. From the base of the trunk (it's only 3/4" wide) it has sort of spidered out to 7 spindly branches but there is no leaf growth for about 10 inches so it looks very weird! Have added some photos at the link below. Am wondering if I was to brutally prune it to the base again, will it grow back? The other one is doing much better and is in the same spot, pot and soil. Different species though I think. Any help and guidance would be much appreciated. I'm pretty black thumbed!

http://www.inhongkong.hk/homestuff/oliver.html