Normally, I would give a plant with this problem a small handful of Bicarbonate of Soda and water it in. Wondering if this treatment will suit the above plant.
Clerodendrum Nutans – Yellowing Leaves
Certified GKH Gardening Expert
There are many reasons why a plant may have yellow leaves. The Bicarbonate of Soda will not hurt it, but it may not fix the problem. This article can give you some ideas of what may be causing the yellow leaves in your plant: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm