I have 1/2 dozen Eumundi quondongs along my back fence line. They all seem to be doing fairly well except one which isn't growing and is 1/2 to 1/4 the size of the others and looks scraggy. This is the second Quondong I have planted in this position and both have not flourished. from the picture attached you can see the difference in size of the plant on the right. it also has less new growth, leaves are a lighter green and it seems to being have more leaves with insect attacks. I have tried watering more, less mineral trace elements etc. I would appreciate any advice. Thankyou