I have a pieris in the garden for roughly four years and it does not seem to have grown. There is new growth beginning which has bright red leaves. The old leaves are a yellow colour and it has never flowered. It is planted in the front of the garden which gets full sun. I have a south west facing garden. Perhaps this is the reason as I have another pieris which is in partial shade in a pot in the front of the house and has flowered and is doing well. Should I move it and when would be the best time.