Mahaganapathy Homam: 

The meaning of Lord Ganapathi is the “Lord of the Ganas”. In vedic puranas and bhuddist culture Maha Ganapathi is called as Vinyaka.In south India he called as Pillaiyar. the maha ganapathi homam, worshiping lord ganaesha gives us health, wealth and all prosperity in our life. Maha Ganapathi Homam removes all obstacles in our life and gives us victory.

Maha Ganapathi homam mainly did while ghravhapravesham (entering into new house). It is also good to perform while entering into rented house also.Lord Ganesha (elephant faced God) is always worshipped before starting any Pooja or Homa. Lord Ganesha removes all obstacles. Lord Ganesha is also known as ‘Vigneshwara’ [vigna + Eswara] which means the lord who removes all obstructions (Vighna).Performing Ganapathy Homa once every year will give prosperity, health and wealth.
Ganapathy Homa should be performed on all auspicious occasions.If any one is running Ketu dasa or bhukti or there is some dosha of Ketu in the horoscope, he can perform Ganapathy Homa and get-relief. Performing Ganapathy Homa once every year will give prosperity, health and wealth.Ganapathy Homa should be done on Shukla Chathurthi day of Bhadrapad i.e. the birth day of Lord Ganesha.Maha Ganapathi homam can be done for reunite in family, to get cured of various diseases, as already explained to remove obstacles while performing any objectives, for education and marriage, done at the start of any homas and for entering new home.
The mola mantra for Maha Ganapathi is:
om shrim hrim klim glaum gam ganapataye varavarada sarvajanam me vasamanaya svaha|
The vedantha manthra for Maha Ganapathi is:
om gananam tva ganapatim havamahe kavim kavinamupamasravastamam|
jyestharajam brahmanam brahmanaspata a nah srnvannutibhissida sadanam|