I tried sprouting 5 avocados from trader joes and none of them sprouted after several weeks.... could it be the dreaded bud nip!!!
this youtube video entitled My Potato Project; The Importance of "Organic"
really explains a lot.
Lets all do our best to preserve our seeds, buy from local organic farms and support viable seeds in all of our fruits and vegetables. I would rather have viable seeds and buds than bud free fruits and vegetables.