Yellow leaves can be a sign of many things, including underwatering, overwatering, too much sunlight/heat, lack of nitrogen, or salt/fertilizer burn, to name the more common ones. When leaves brown around the edges, the problem is often salt burn. Salts in the water and in fertilizer build up over time.Click to see full answer. Accordingly, why are my Aralia leaves turning yellow?There are a couple of possible reasons for the leaves of ming aralia (Polyscias fruticosa) to turn yellow and drop. Sudden temperature drops to 70°F or lower can cause this tropical plant’s leaves to lose their color and fall off. Another issue that could cause yellowing of leaves is overwatering.Additionally, why is my castor oil plant going yellow? It likes, at best, a few hours of sunlight in the morning. Older leaves will naturally droop and turn yellow before they fall off, but if the whole plant is a pale colour it is suffering. It also hates drying winds. You can easily rectify the problem as it’s a tough plant. Herein, how do you care for fatsia japonica? Water the plant often enough to keep the soil moist at all times. Check plants growing in containers often as they can dry out quickly. Fertilize plants growing in the ground in spring after the danger of frost has passed. Use a tree and shrub fertilizer with an analysis of 12-6-6 or similar every year.What do you feed fatsia japonica? GROWING FATSIA JAPONICA IN CONTAINERS The plant should be fed monthly between mid March to mid August with a handful of blood, fish and bone. It will of course require regular watering. Wait each time until the top 3cm of the compost is dry and then water well.