Siddhidatri Mantra is chanted on the ninth day of Navratri (September – October). There are four Goddess Siddhidatri Mantra and they are in Hindi. The four mantras are Mool, Dhyan, Stotra and Kavach. The popular belief is that chanting this mantra will help in attaining wealth and peace. The prayer is also chanted for good health and wish fulfillment.
A devotee can chant any of the mantras. He can also put them into any combination and chant. Like some people chant Mool and Dhyan or Mool and Kavach.
Most devotees only chant the Mool Mantra.