Anchoring above the ground using one or more tree stakes and bands is the most common method. This type of anchoring remains in place for three to five years, until the tree is sufficiently anchored itself, through its stabilising roots. The stakes and bands are then removed. If a single stake is used, this must be placed on the prevailing-wind side. The tree will then 'sway' in the opposite direction to the stake. If this rule is not observed, the tree will sway towards the stake too often and damage could be sustained, through which parasites can enter the tree. In the case of whirlwinds or downwinds around tall buildings or larger trees, more stakes will be required. If three stakes are used, the advantage is that an irrigation barrier can be attached to the stakes, so it remains in place better. Make sure the bands are not attached too firmly, a little slack encourages root development and better anchoring in the long run.