Rose petals?

Question:my don jaun roses have black edges, look like burnt edges. Whats up with that?

Answers:
if plant is not absorbing enough water, the new growth will actually dessicate and dry up right on the plant.

Botrytis Blight (fungus): The petals can then turn brown at the bottoms of the bud like shreds of a paper bag. In serious cases, infected leaves can appear as if they are rotting away. Sometimes there can be a grayish brown fuzzy growth on parts of the infected portions. Lower petals on these blooms dead and brown. A gray mold can also occur at the base of canes that are covered by leaves or mulch. The problem is most severe in humid and cool (60 degrees F) conditions. The disease tends to start high and run down the stem so that over time, more and more of the plant becomes infected. The blight survives winter as black lumps in the soil or on dead infected canes and buds that have not been pruned off.