Chamomile is a great source of potash, calcium and sulfur, and is also good at boosting your plants. Also, it perks your plant up after the flushing, or any kind of stress for that matter. I had a dying seedling a while back and I am convinced it was the chamomile that saved it. Try it out some time.
O yea, it also makes your plants smell AWESOME!
This is just something I picked up working at a garden center a few years back.