Who know this rare and non sense question?

sounds a lot like KNF where they ferment plant tissues/fruits and flowers/leaves into soil serums. Normally you don't use the same plant your feeding or in an un-fermented manner. The only remote benefit I could see is if some of the plants hormones are water soluble, they then could be taking up by the roots. but this is a far stretch, so many variables not really worth it IMO. Good Luck!

No, absolutely BS! There is nothing in dried or harvested buds that would feed growing buds.

composted... sure. as is? i doubt it. something would hve to break it down to be plant useable. wouldn't be 'all it needs' just cause it was once a pot plant.