I have this Skimmia (quite big and sturdy, don't know how old; I'm also not used to caring for a Skimmia) that, since February, has changed color of the foliage. It used to be dark green, now it's towards yellow where it seemed to stabilize. Leaves look still healthy and intact. No pests as far as I can see, I checked everywhere. No sun almost at all in the past 4 months, but the plant is badly positioned in too much sun.
The flower capsules have also changed color from dark red to a lighter version, but also look healthy otherwise.
I fed it twice recently, and mixed the ground with compost.
Anything else you recommend me to do? Thank you.