The blackthorn tree is one of the eight chieftain trees in the Ogham divination and it is the great protector. Burning it banishes any negativity. If the attack is intense, burn blackthorn for a period of seven days on the waning moon and you will be cleared of all curses or ill intent.
The ancient druidic Celts understood the language of the trees. They could speak the tongues of the rustling leaves and the reflection of light that fell upon their sacred grounds. They could see into the far off times beyond the confinements of man made rules. They knew the spirit of each and every stone, plant, tree and animal that walked their lands.