I've got a two year old oak that I dug up and transplanted from parents house to mine. It took really well. It's 5 inches tall and has 20 leaves so far. The problem is that it's has multiple branches from 1/4" off the ground. I need to eventually knock off the odd branches. So when should I do this, now, fall, 5 years? I want this tree to grow strong and straight. Thanks.