Root. In the computer world, root refers to the top-level directory of a file system. The word is derived from a tree root, since it represents the starting point of a hierarchical tree structure.
Use a fertilizer with high levels of phosphorus. Phosphorus helps to prevent aluminum from creeping into the system of the hydrangea. Choose a fertilizer close to the ratio of 25/10/10 (Phosphorus is the middle number).
1 New-wood ï¬owering hydrangeas can be pruned each early spring, just as the new growth begins to emerge. 2  Remove up to one-third of the height each year if desired to encourage vigorous new growth and strong stems to. 3  support the ï¬owers. 4  Hydrangeas do not strictly require regular pruning.