Callicarpa bodinieri 'Profusion' - Beauty Berry Leaf Yellowing
I have 2 Callicarpa bodinieri 'Profusion' growing in clay pots which I only purchased last winter from Tesco. They looked fine and healthy when I bought them. After replanting them in larger pots (in April) I have fed them with Growchar and some neem cake. Since then one of them is doing well while the other one is rather poor in comparison. The colour looks yellow-ish and the leaves have green veins. It also hasn't grown as much as the second one. Both of them had exactly the same treatment, I believe. Maybe I used different potting soils, as I had several bags from different brands - not sure. The visible difference in the soil is that the yellow one has some sort of algae growing in the soil at the bottom of the trunk (since winter). I didn't remove it because I thought it might be some sort of symbiosis and it will dry off in summer, but it hasn't so far. I tested the soil PH which was 5.5.-6. Any advice on what is causing the unhealthy foliage?