Leaves on 2 of my roses curled down / downward. What could have caused this? I wonder if I over-fertilized them... or something to do with the soil pH. No sign of pests. The ribs were just naturally concave downward and hardened over time. The leaves were hard and not happy to the touch. All my roses are grown in containers. I fed them with chicken manure every two weeks. All of them flowering well. My garden receives full sun, temp at 90F all year long, and the roses are watered twice daily.
