Some climbing rosebushes are once per season bloomers. So you only get one flush of blooms per growing season. Some climbing only bloom on that is called the Old Wood or the last years growth. Pruning can take the old wood growth back too far and thus eliminate the next growing seasons blooms or severely limit them. Another thing that can cause a lack of blooms is using fertilizers that are too high in nitrogen. Such fertilizers make them grow well with lots of foliage but either limit or eliminate the blooms production. Some bloom buster fertilizers are very high in nitrogen, thus will actually eliminate blooms if used too often but they do not specifically tell you that.
Answered on September 6, 2018
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