Guest: (indistinct) Any worship we first worship Lord Ganeśa, India.
Prabhupāda: That is not necessary. That is not necessary. If we worship other demigods to fulfill our, some particular desire... (Hindi) There are different demigods they worship, but one who knows that "If I approach Kṛṣṇa, the Supreme Lord, then everything is obtained..."
Room Conversation -- November 11, 1971, New Delhi
So far worshiping Ganesa is concerned, that is not necessary. Not that it should be done on a regular basis. If you like you can pray to Ganapati for removing all impediments on the path of Krishna Consciousness. That you can do if you like.
Letter to: Sivananda — London 25 August, 1971
The Ganesa puja may not be performed. No, it is not to be done. No need of it.
Letter to: Sudama — Bombay 21 November, 1974
Regarding Ganesa Puja, I have received some letters from persons requesting to also perform it. I have explained to them that ultimately it is not required, but if you have some sentiment to get the blessings of Ganesa in order to get huge sums of money for service of Krishna, then it can be done, but privately. I have instructed them that if they want to do it, they must send me at least 100,000 dollars monthly—not less.
Letter to: Gurukrpa — Bombay 31 December, 1974