serpentandstang:

By Martin Duffy, Three Hands Press

‘Within the witch’s craft many apparently mundane objects are considered to have both magical and mystical virtue, one example being the humble nail. Although some, on basis of morphology, ascribe to nails a phallic virtue, they also have a fixative power, i.e. the ability to bind one thing to another, for good or bane. Nails also partake in no small measure of the powers ascribed to their material, which is normally iron, that heavenly metal linked in the occult mind with blood and the virtues of redness.

When a thing is brought into contact with another it makes an alligation. The basis of alligation is that all things created, whether by the hands of man or nature, are bestowed by the Soul of the World with virtue, which is harnessed by bringing the virtuous object into contact with people/places/objects. Included in this is the binding of two things together in alligation by a nail, so that one might influence the other.

The thing or power being fixed by the nail to person, place or object can be manifold; even celestial powers corresponding to the time at which the nail was struck into its medium can be bound into workings. Herein we understand the basis of hammering various amulets into the lintel above the threshold, such as the apotropaic images of the sun, open hand or ubiquitous horseshoe.

Contrary to popular belief, nails are as protective as the horseshoes they affix. Indeed, Pliny the Elder advised hammering three iron nails, not horseshoes, into the threshold’s lintel to protect the home, likewise Paul Huson in Mastering Witchcraft advocated driving three iron coffin nails into the door, one above and two below in triangular formation. Similarly, protective enclosures are fashioned by striking nails into their four corners and wandering spirits are stopped by hammering nails into their coffins, whilst Romans averted plague and misfortune by driving nails into house walls. Thus is it axiomatic that the number of nails found within a horseshoe affects its potency, the more nails the greater the luck, although some hold true to the custom of fixing the shoe with three nails by means of three blows, alluding to the kinship betwixt nails and the number three.

Horseshoe nails have long been held to possess an array of powers, e.g. the crooked horseshoe nails hung as amulets about the necks of Irish children, and the horseshoe nails driven into the hearth by Teutonic peoples to draw back stolen property. Traditional witch Robert Cochrane recounted that “a horseshoe nail dipped in spring water was considered a prime remedy to use against the ‘little people’ when they grew bothersome”, which relies also on the well-known enmity betwixt the Fair Folk & iron.’
…

‘The most familiar witch tradition concerning nails is their use to pierce the witch’s manikin with benevolent or malevolent intent, yet there is equal tradition in using blackthorn spines, which like nails have an innate warding virtue. Thorns are often used alongside or in place of nails in the magical arts, e.g. in the famed witch-bottle or being tied into the end of the curse cord in place of a rusty nail. We might thus consider them as ‘wooden nails’ fashioned by the green hand of the Faerie Smith, to which Schulke alludes in Viridarium Umbris when he says, “the Thorn is both punitive & binding, the Holy Nail of the Greenwood executing the grim sentence of Crucifixion at once harnessing the forces of binding & torment”; it is in the crucifixion that we discover the nail’s apotheosis.’ 

Read more.