Planting three red flowers in the new moon will keep trespassers off property and allow the land to return to a wild well-being. I suggest penstemon, wild roses, geraniums or nasturtiums.

To heal and guard an ailing or endangered tree, an old Celtic custom involves tying a red ribbon around the trunk and chanting:

Red for the sap-blood inside this spirit-tree,
Every Full Moon,
I will retie a cord of magic around thee.
So mote it be!