When Ryan Murphy, the creator of “American Horror Story,” announced that the third season of the American TV series would focus on witches, he was riding the crest of a growing wave. Not since the 1990s — the era of Buffy’s geek goddess, Willow Rosenberg, and a scowling Fairuza Balk in The Craft — have witches been so much in demand.

In the young-adult section of bookshops, shelves that recently groaned under the weight of tales of tormented vampires and lovelorn werewolves are now stuffed with stories of witchcraft and magic, from Ruth Warburton’s much-praised “Winter Trilogy” to Jessica Spotswood’s Cahill “Witch Chronicles.” Lower down the age range is the most recent in Jill Murphy’s long-running “Worst Witch” series, while for adults, next year will mark the climax of Deborah Harkness’ “All Souls Trilogy,” centering on the relationship between a vampire and a feisty American witch.

In film, highlights of the British Film Institute’s (BFI) gothic season, in central London, included “Burn Baby Burn!” a festival of witchcraft on film, now heading to Belfast’s Queens Film Theatre, and the once-banned 1922 Danish witch movie “Haxan: Witchcraft Through The Ages,” which showed at Filmhouse Edinburgh and at the Glasgow Film Theatre and Dundee Contemporary Arts. Even Meryl Streep is getting in on the act — recent stills from the forthcoming film adaptation of Stephen Sondheim’s “Into The Woods” showed the actress transformed into an old hag complete with wild gray hair and long nails.

However, it is on television that the season of the witch has truly taken hold. In addition to “American Horror Story,” with its tale of voodoo queens and teenage witches, there’s Lifetime’s “The Witches of East End,” adapted from a novel by Melissa de la Cruz and featuring a family of spellcasters led by Julia Ormond. Vampire Diaries spinoff “The Originals” (on the Syfy channel) has a central story line about witchcraft and in Universal’s “Sleepy Hollow,” Ichabod Crane deals with dueling covens in present day America.

So why witches — and why now?

“I think the idea of being able to manipulate supernatural forces still resonates,” says Owen Davies, professor of social history at the University of Hertfordshire, southeast England, and author of “America Bewitched: The Story of Witchcraft after Salem.” “Witches and ghosts speak to something fundamental and innate within our psyche. It’s an emotional connection.”

It’s true that the last time witches were so in fashion, in the 1990s, the response from young girls was intense.

“When Buffy and Charmed were at their peak, I would get letters from teenage girls, mainly from America, asking for help about where to look for spells,” says Davies. “Those shows gave teenage girls a feeling of empowerment; there’s something very appealing about magic and witchcraft. There have also been studies of girls who were interested in witch shows in the 1990s, following how many of them went on to become practicing wiccans. It’s not a huge number, but it’s interesting that some of them watched the shows and thought, ‘I want to know more.’ “

Ruth Warburton, whose latest young-adult novel, “Witch Finder,” will be out in January, feels the growing interest in witches is partially driven by a teenage desire to see girls in less passive roles. The most striking thing about the recent movie “Beautiful Creatures” (itself adapted from a bestselling teen novel) was that the hero worshipped from the sidelines as his witch girlfriend came into her growing powers.

“Often the traditional way of looking at relationships in young-adult fiction is that the guy has all the power and the interesting life and the girl goes along for the ride, but that’s not the whole story,” says Warburton. “Increasingly, we’re trying to bring our daughters up to believe they can be the leader; they can have the adventure; they can do the cool stuff, and one of the things about witches is that they allow you to explore that moment when girls become teenagers and realize the power they have as women and how exhilarating that can be.”

It is also arguable that these new shows reflect a changing attitude in television. The era of the anti-hero is coming to a close with the end of “Breaking Bad” and the final seasons of “Mad Men.” In their place have come female-centric shows, from “Orange is the New Black” to “Masters of Sex,” and “Scandal.” Thus “Witches of East End” is as interested in the bonds between mothers and daughters as in potions and curses, while “American Horror Story: Coven” conducts a serious examination of outsiderdom, exclusion and the nature of power.

“The witches are a great allegory for any minority group that’s been persecuted and had to go underground and finally is like: ‘You know what? Dammit no, we’re fighting back,’ ” the show’s creator Murphy said.

It helps that both shows are happy to play with stereotypes. We tend to see witches as withered crone or seductive enchantress, Baba Yaga or Morgan Le Fay, yet for “Witches of East End,” the key is that these women are a normal family with a family’s ups and downs. But Davies argues that the key to witch-related success remains image.

“The image of the witch has transformed from someone extremely dangerous, through the sexy domesticated witches of ‘Bewitched’ to the new wave of young, sexy witches in ‘Charmed’ and ‘Buffy’ to now,” he says. “We’re not interested in the mundane reality — we don’t want to watch a drama about someone falsely accused of bewitching a pig.”

In other words, just as our vampires are now soulful lost boys, so our witches must be appealing in looks, if not always in deed.

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