What is the general guideline for pruning informal, single-trunk shrubs in terms of the diameter of the retained branch?

What is the general guideline for pruning informal, single-trunk shrubs in terms of the diameter of the retained branch?

• A. Prune to a lateral branch that is one third the diameter of the branch being removed
• B. Prune to a lateral branch that is half the diameter of the branch being removed
• C. Prune to a lateral branch that is the same diameter as the branch being removed
• D. Prune to a lateral branch that is two thirds the diameter of the branch being removed

Answer: (A)

When pruning informal, single-trunk shrubs, aim to cut back to a healthy lateral that is about one-third the diameter of the branch you’re removing. This ratio gives a strong, well-supported point for new growth while keeping the wound size small enough to heal quickly and reduce the risk of decay. If you leave a retained branch that is the same size or much larger than the removed branch, the resulting wound is too big for the plant to seal cleanly, increasing decay risk and weakening the branch union. If the retained limb were too large relative to the cut, it also disrupts the shrub’s natural form. A one-third diameter retention balances healing, strength, and appearance.

When pruning informal, single-trunk shrubs, aim to cut back to a healthy lateral that is about one-third the diameter of the branch you’re removing. This ratio gives a strong, well-supported point for new growth while keeping the wound size small enough to heal quickly and reduce the risk of decay. If you leave a retained branch that is the same size or much larger than the removed branch, the resulting wound is too big for the plant to seal cleanly, increasing decay risk and weakening the branch union. If the retained limb were too large relative to the cut, it also disrupts the shrub’s natural form. A one-third diameter retention balances healing, strength, and appearance.