By so doing the mystic fern seed may be obtained, which possesses the strength of thirty or forty men.

In Germany, too, a species of wild radish is said to reveal witches, as also is the ivy, and saxifrage enables its bearer to see witches on Walpurgis Night.
But, in spite of plants of this kind, witches somehow or other contrived to escape detection by the employment of the most subtle charms and spells.

They generally, too, took the precaution of avoiding such plants as were antagonistic to them, displaying a cunning ingenuity in most of their designs which it was by no means easy to forestall.

Hence in the composition of their philtres and potions they infused the juices of the most deadly herbs, such as that of the nightshade or monkshood; and to add to the potency of these baleful draughts they considered it necessary to add as many as seven or nine of the most poisonous plants they could obtain, such, for instance, as those enumerated by one of the witches in Ben Jonson's "Masque of Queens," who says:-- "And I ha' been plucking plants among Hemlock, Henbane, Adder's Tongue; Nightshade, Moonwort, Libbard's bane, And twice, by the dogs, was like to be ta'en." Another plant used by witches in their incantations was the sea or horned poppy, known in mediaeval times as _Ficus infernolis_; hence it is further noticed by Ben Jonson in the "Witches' Song": "Yes, I have brought to help our vows, Horned poppy, cypress boughs, The fig tree wild that grows on tombs, And juice that from the larch tree comes." Then, of course, there was the wondrous moonwort (_Botrychium lunaria_), which was doubly valuable from its mystic virtue, for, as Culpepper[22] tells us, it was believed to open locks and possess other magic virtues.
The mullein, popularly termed the hag-taper, was also in request, and the honesty (_Lunaria biennis_), "in sorceries excelling," was equally employed.

By Scotch witches the woodbine was a favourite plant,[23] who, in effecting magical cures, passed their patients nine times through a girth or garland of green woodbine.
Again, a popular means employed by witches of injuring their enemies was by the briony.