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).
Types of hydrangeas best suited to grow in sun and shade include smooth hydrangeas, oakleaf hydrangeas and annabelle hydrangeas. These varieties of hydrangea are more apt to keep their shape in areas with almost complete shade.