As a beginner and trying to learn as fast as I can, I was thinking about fertilizing my orchids. How do you tell if you are overfeeding? What brought this thought to mind was my miniture rose. The edges of the leaves are turning brown inside the house beside my orchids. I have a tendency to feed once a week, using 20-20-20 fertilizer. Any thoughts or suggestions would be appreciated, as I wouldn't want to do any of my orchids harm.