Answer: It's possible the pink rims on your Iceberg roses is quite natural. A true Iceberg has white petals, but soil conditions or fertilization can change things a bit. Iceberg flowers profusely over a long season so dropping petals is a common occurance. (The plant is putting as much energy as possible into developing new blooms, so that once a rose has matured, it's ignored by the plant.) Cut the spent flowers and stems back so you'll get additional blooms. If you want the roses to last, cut them from the plant just as they begin to open and place them in a vase of water. The white substance on the leaves is probably powdery mildew, a common problem with roses. Believe it or not, many rose growers actually sprinkle the leaves in the morning in an effort to wash the spores from the leaves before they become established. Try to prune the plant to improve air circulation, and pick off any affected leaves as soon as you see them, to prevent the spread to healthy plant parts. If all else fails, there are some chemical fungicides that can be used to control powdery mildew.
Q&A Library Searching Tips