I bought a fig tree 2 Septembers ago from the UBC Botanical Garden shop. It was a tall stick when I bought it. It is still a tall stick (see the attached photo). Last year it unfurled a number of large leaves at the top and one fig which ripened. This year it looks to be unfurling some more large leaves at the top, but no side branches as yet. How do I encourage the growth of side branches?