In general, windbreaks are effective up to a distance of 10 times the height of the windbreak. So for example a windbreak 1 m (3 foot) high will provide protection from wind for a distance of up to 10 m (30 foot) from the windbreak. This gives plenty of scope to place the windbreaks far enough away from a bush so that soil fertility is not effected but wind protection is effective.
With careful tying off just thought it might help