I bought a small rose bush on Mother's Day this year and planted it in my flower garden. The area probably has too much shade for a full sun plant, but I don't think that is the issue here.
Shortly after planting, its leaves began to develop black splotches and fall off. The leaves are mostly gone at this point. Aug 31, Too little water or stressful conditions, like drought or a heat wave, can cause a rose bush to drop its leaves in an attempt to conserve energy.
A Visual Guide: Rose Problems Black spot of rose Black spot is the most important disease of roses and one of the most common diseases found everywhere roses are grown. The disease does not kill the plant outright, but over time, the loss of leaves can weaken the plant making it more susceptible to other stresses and to winter shrubcleanup.buzz Size: 1MB. Oct 16, I have a red climbing rose, 'Rambling Red', which leafs out beautifully in the spring, blooms well with repeat bloom till frost, and doesn't have any black spot.
However, after the big June bloom, 90% or more of the leaves simply fall off. They aren't even yellow, and definitely don't have any black spot.