Last week I bought two larger specimens of Pennisetum alopecuroides 'Cassian' at the nursery. Back home I had difficulty freeing them from the pot. I had to cut the pot and discovered that these were two cases of extremely rootbound plants. The roots were one solid mass, no soil whatever to be seen at the outer edges of the ball. I made some vertical cuts in the rootball to free the roots, which wasn't easy either, and planted them. The plants don't look to bad right now, the leaves are still erect as they should be, but some of the leaves (mostly at the base of the plant) are turning yellow. It makes me wonder whether I did the right thing. Should I be alarmed by this? Is there anything I can do to increase the chances for a healthy growth? Or should I just sit down, relax, cross my fingers and hope for the best?