Acacia - Carry the wood as a protective amulet.
Angelica - Grow in the garden for protection.
Bay Laurel - Wear as an amulet to ward of negativity and evil.
Cactus - Fill a jar with cactus spines, rusty nails, old tacks, pins, and needles.  Add rue and rosemary leaves to fill the jar, seal tightly, and then bury under your doorstep as a powerful protective device.
Celandine - The herb aids in escaping unwarranted imprisonment and entrapments of every kind.  Wear the herb next to the skin.
Comfrey - Carry the herb while your traveling to ensure your safety.  Put some in your luggage to make sure it arrives at your destination.
Cyclamen - Grow in the bedroom for protection.
Fern - Grow in the shady areas of the garden and in the house.  Throw fern on hot coals for an aura of protection.  All ferns are extremely powerful protection.
Frankincense - Mix with cumin and burn as a powerful protective incense useful for general working.
Garlic - Take garlic with you when you travel over water to prevent drowning.
Ivy - Grow on the outside of your house as Ivy is used as a guardian.
Juniper - Carry a sprig to protect yourself from accidents.  Grow at your doorstep for protection.
Periwinkle - Hang on the door to protect all within the building.
Primrose - Plant in the garden to protect, especially the blue and red varieties.
Thistle - Grow in the garden to ward off thieves.

(via thelastpapertiger)