
Certified GKH Gardening Expert
Typically, they can take on a reddish cast if exposed to cool temperatures. If this is the case where you are, the red will fade as the weather warms. It also may be a reaction to being transplanted. Just to be on the safe side, I would treat them as though they have mild transplant shock. This article will help you with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm