I planted a couple of queen palms over two years ago, they are deep green, healthy looking with new fronds appearing, yet the same size as when they were first planted. They get lots of sun and I water them good at least once a week. I've given them palm food as well. I live on the SF peninsula and we have had plenty of warm weather. Anyone know what the problem might be? The other queen palms I see in the area seem to be growing so well.