The seed, tree and the fruit
The third sloka of the first chapter of the first canto of Srimad Bhagavatam talks about Bhagavatam being the very essence of the fruit of the tree called the Vedas. Although he it does not explicitly talk about the seed for the tree called Vedas, the first two slokas talk about the Supreme Lord who is the basis of all the Vedas, and thus is the seed of the wish-fulfilling tree called the Vedas.
Thus the Purana talks about the seed called Lord Narayana, the tree called the Vedas and the fruit which is verily Srimad Bhagavatam itself.
This is Sri Vallabhacharya’s way of looking at the Purana.