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Clematis

My clematis is a few years old. It started this year looking healthy with lots of buds. However, some open but just as many drop off along with leaves with brown marks. I haven't seen any bugs and the soil isn't too wet/dry. Any advice?


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They need correct compost for ericaceous plants and to be watered with rainwater or soft tap water, no hard water. Otherwise they will drop flower buds and the foliage will be weakened and may also turn yellow, or chlorotic.
They also need to be sited out of the early morning sun to avoid having any frozen buds thaw too quickly or they turn brown and may drop off. They must not be allowed to go thirsty between July and October or this affects flower bud formation and they will either fail to form or drop off as the plant diverts water to save its foliage.