Keep an eye on him, remove any other fake plants / decor that he could get stuck in. Depending on when his next feed day is he may not eat. If the plant was wrapped around his head he could be very sore for a few days. If he is a light colored snake watch for bruising/redness in the area - you may or may not be able to see it. If he starts acting strangely (not moving head/body normally, weakness, in ability to coil) these would all be signs of possible spinal injury, and he would need to go to the vet. Also keep an eye on him when he does eat next, he could have a small cut that is not visible until the skin stretches while he eats.