Holly is often thought of as the remedy for anger - but this isn't necessarily the case. Where Holly is for anger, it will be because the anger is based specifically on hatred, suspicion, envy or jealousy. But in other cases other remedies would be needed, such as Impatiens when anger is due to impatience, Vervain where it is caused by a sense of injustice, or Chicory where the angry person feels snubbed and hurt by ingratitude in others.
Holly is for very negative, aggressive feelings directed at others. The basic problem is an absence of love, and the remedy works to encourage generosity of spirit and openness towards others.
Dr Bach's description - For those who sometimes are attacked by thoughts of such kind as jealousy, envy, revenge, suspicion. For the different forms of vexation. Within themselves they may suffer much, often when there is no real cause for their unhappiness.