Clematis

Why is my clematis growing 1 stem and a few branches above 3ft to 5ft. It is in a west facing border in bud at present, Large white flowers(?name)How can I encourage more branches lower down. It has been in that position for 3years, this the 3rd year. Any advice would be useful.
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However, you can also treat it as a group 3 to re-invigorate it and that means pruning it down low in March/early April, giving it a generous feed, a good drink and some mulch and then it will grow a whole load of new stems you can tie in lower down so the stems are horizontal or diagonal. This will increase the number of flowers all along the stems and they will flower for one longer period over summer.
The following year you can then go back to treating it as a group 2 if you prefer.