The biggest seeds I found so far were coconuts... but they're small compared to Coco de mer. The largest beans I've seen were some sort of acacia at a Chinese shop. ROFL!
Besides, there's already a related thread somewhere on IC .
The biggest cannabis seeds I've seen were the original jointdoctor lowryder that grew comical plants that if badly tended didn't reach six inches tall! Autos have come a long long way in stature and potency since.
The largest seeds I have are 12 to one gram, I collected from Yunnan China.
The smallest are over 800 to one gram, I collected in Kashmir at 9,000 feet.
I grew the tiny ones at sea level to see if the altitude made the seeds smaller, but they were the same size when I grew them at sea level. They look like poppy seeds. The small seeds grow normal plants, no or little THC, and the ripe seeds will pop from the plant if the plant is touched at all, just like they were loaded in a spring. Hard to collect....
These are the small ones with the big ones I think but am not sure what the count per gram was of the big in the photo, 12-20 per gram I would guess.
-SamS