where do seedless watermelons come from?

[psteve]

It's the unpollinated female false seed pods.

All bud SHOULD be seedless, but because people obviously have no idea how to grow [or the grow is too big to pick out the males] you get seeds.

I think seeded bud is alot more common in America than England.

Yes.
That's partly because of the wild hemp that still grows across America. We call it 'ditch weed'. It's pollen goes far and wide, deflowering our girls along the way.