Cover those roots with a cotton cloth followed with a few layers of old newspaper and soak them with water, add a very small amount of plant food (local gardening center will point you in the right direction), make sure that the covering is moist to the touch 3 hours after the soaking. Repeat this procedure every 4th day for about +/- 5 weeks. It will spur the plant to a new growth cycle, and it will be fine. -Birdy