I bought two potted mini roses 2 weeks ago, and placed them on south facing window sill. One was doing great, the other has some yellowing leaves that I didn�t pay attention at first. Then more leaves turned yellow so I moved it away from the healthy one, afraid that it�s due to fungus and may be contagious. I sprayed both with anti-fungus just in case. I water them once a week after they dried out (the leaves and flowers became withered looking). I made sure the water drained well each time. However, the healthy one started to have yellow leaves 2 days ago when the soil starts to dry out a little bit. What did I do wrong? I�m not sure if it�s due to too much water, too little water or fungus. All the yellow leaves are at the bottom inside portion of the plant, as if there is not enough sunshine. I put them at the sunniest spot of the entire house. By the way, I plan to plant them on the ground when it�s warmer. When is it warm enough to do so, ave temp 65?