To maintain a formal hedge full of foliage, what must be adjusted in its pruning?

Pruning a formal hedge to ensure it remains full of foliage at the bottom while maintaining an aesthetically pleasing shape requires careful consideration of the hedge's width at different levels. Adjusting the base to be wider than the top allows sunlight to reach the lower foliage, which is essential for keeping it healthy and lush. When the base is wider, the top canopy can effectively shade the sides and protect the lower leaves, preventing them from becoming sparse or bare due to insufficient light.

This technique not only promotes robust growth but also contributes to a stronger structural integrity for the hedge, making it less likely to become leggy or unkempt over time. The overall form enhances visual appeal by creating a more balanced and symmetrical appearance.

In contrast, other pruning methods might not achieve the same fullness or could lead to uneven growth, diminishing the overall effectiveness of the hedge.