“Whenever I prune a plant, it sickens and dies. Why does this happen?”

It may be based on an aspect of plant growth and development. Plant health and harmony is predicated on the balance between root and top growth. The balance between plant roots and top growth is not necessarily based on equality between the biomasses. In the majority of plants from grasses to trees, root systems often constitute 90 percent of the total biomass of the plant.

Consider the distinct role (function) that is performed by the roots. Plant roots anchor a plant to keep it upright. Roots continually quest for water and nutrients. As the roots constantly mine the minerals within their reach, the roots must ever expand to locate fresh supplies. The ability to manufacture new roots in an ever-expanding area is fueled by the above-ground leaves. The green leaves must produce sufficient carbohydrates to support existing leaves, produce new ones, supply energy to the roots and have a surplus to spend on flowers, fruits and seeds.

To maintain its essential balance between top and roots, plants maintains a constant chemical conversation between root tips and twig tips. Any reduction of energy supply by pruning, insect feeding or any other cause impacts root growth and plant health.

Thus, extensive pruning can upset the balance between tops and roots, resulting in less energy supply to the roots. This causes roots to weaken and die, leading to too few roots to support the top growth, which can result in an endless spiral downward, resulting in death of the plant.

Plant growth can be modified if done in gradual steps so as to not upset the plant balance. Moderation is key.