If you want to get the Havan done for the Guru Griha, then use the wood of the Peepal tree in the Havan, it will be auspicious. According to Padma Purana, Peepal tree is the form of Lord Vishnu. That's why it got the status of the best god tree in the religious field and started worshiping it by law. Peepal's samidha provides progeny, progeny growth, sycamore gold, Shami destroyer of sins, Durva's longevity and Kusha's samidha should be used to fulfill all desires. Peepal wood is used for fuel but it is not suitable for any building work or furniture. Peepal is considered very useful for health. The use of twigs, wood, leaves, copals and seers of peepal is mentioned in jaundice, night blindness, malaria, cough and asthma and cold and headache