I have an established butterfly bush that has a serious lean to it. I was cleaning up and noticed that the soil on the backside of the plant looked like the roots were starting to pull up, much like some trees do when there has been too much rain. I would like to "right" it by losening up the soil around the front of the roots and re-positioning it. I will be pruning it this week (I always prune in the spring, gets me out of the house after a long, cold winter ), and I was thinking about trying to "fix" it then. Because it has been there a few years, and this is the first time that I noticed this problem, I was wondering if there were any tips on how to do it without damaging the plant.