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).
â¦ If the pH of your soil is too high (alkaline), it can be reduced (made more acidic) by the addition of one tablespoon or more of Aluminum Sulfate per plant â this will make your flowers a deeper blue. Coffee grounds and tea bags can be used as a mulch around hydrangeas.