Susie,
The only thing I can see as missing is compost. If you only have sand and gravel, it might be missing micro nutrients from loamy soil. I top dress my pots every year with compost and given that you have a long growing season, I would do it twice a year.
BTW, I believe stem growth is directly related to the amount of sun available to a plant. So if your trees are in direct sun, it might produce shorter stems, since it doesn't need to reach for the sun. Please if I'm wrong with this hypothesis, correct me. I have had the same plants grown in two different areas of my yard and the ones in the sun are smaller then the ones with some shade to them.
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