My rosemary is browning on the tips and so is the new growth. I suspect either parasites or that the rosemary is not happy with its current growing conditions. I do not see spider mites or aphids on it, but I sprayed it with a light solution of gentle dish washing liquid and water. What are the ideal growing conditions for rosemary? How often should I fertilize? Just so I can be sure that is not the problem :) Any other ideas or suggestions? Thank you ever so much!