My juniper bonsai tree is turning pale green, and the needles are very brittle. After searching the internet, I realize that I should have grown it outside so that it could have a dormant winter season, but unfortunately it's too late. I followed the advice of a few websites and repotted the plant, cutting off some of the dead root. Most of the roots were black or dark brown. I'm wondering if there is anything else I can do to try and save it. Is there anything else that might help?