Olive Tree? Well Why Name it That?

They say olive trees can grow anywhere. Cracks in concrete, the side of a cliff, anywhere. They have extensive roots that run deep and spread out, and they can withstand just about any weather. They live long, and they may grow slowly, but they can grow a LOT. And well. I want to be that way in my faith. Being a Christian isn't easy, nor is it always first nature. So yeah. Olive tree.