I planted blue lake bush beans in two raised beds, and they're doing very well, but in one raised bed all the blossoms have been purple and in the other bed the blossoms are all white. They were all from the same seed packet, so I'm wondering if this is a sign that one of my beds is deficient in some nutrient? I'm in my 2nd year of raised bed gardening (the purple blossom batch is in a bed that was new this spring, the white blossoms in a bed made last season), so I'm in the very early stages of what I hope is a long term learning process, and these boards have been a wealth of information.