I have a large Cattleya that I got off of Ebay. When it arrived I unpotted it and saw that the roots were black and mushy. I trimmed them off and placed the Cattleya in a tall vase with moist Spaghnum moss. This was about 3 weeks ago. The orchid has grown no roots and the leaves are deteriorating. Is there anything I can do to save this Cattleya ?