Corrective PruningCorrective pruning can be done to improve the overall health and of a tree. ChlorosisChlorosis is a micro-nutrient deficiency where the tree lacks iron or manganese. Compacted SoilWhen soil becomes too tightly compacted, plants and trees are not able to properly grow their roots. Girdling RootsGirdling roots occur when the roots of a tree wrap around the base of the tree. This causes the flow of water and nutrients to be choked off from the rest of the tree. Plant Growth RegulatorPlant growth regulators are substances that profoundly influence the growth and development of plant cells.