Answer: The flowers of climbing roses appear at the tips of the shoots. So, if you let the shoots grow straight up you will only get flowers right at the top of them with the rest left bare. The trick is to encourage the main shoots to grow horizontally (fan them on a wall or twist them around an arch). This encourages small side shoots to grow from the main shoots and each one of these will produce flowers.
To encourage lateral branching, simply remove about 25% of the main shoots each year (cut down to 6-8in from the ground). This will control the height of the canes along with encouraging new flowering shoots. Hard pruning should remove the damaged areas of the canes and this will prevent diseases from forming. Best wishes with your rose!
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