Apr, May, Jun
For trained fruit and wall shrubs, tie in the new growth when it has reached 10cm - 15cm in length. This will hold the shoot in place until the wood develops to stiffen it.
When using string or garden twine, wind it once or twice tightly around the support and knot in place. Then wrap it more loosely around the stem and knot it twice to secure in place.
Climbing plants often need coaxing to grow up their supports or in the required direction. Loosely tie them in place with soft string so as not to bruise their very delicate stems.