Public Usable facilities at my place are currently, A Rock Saw, Mason's Bench 3 Pottery Wheels, Student's Forge, student's Casting Box, and a lead/copper/iron mine, to the southwest a bit.
(If any of these are currently not usable, contact me in game. thanks :) )
Might have found a way to produce extra onion seeds.
My yield steadily seemed to hold at 9+1, for quite a while. Nine onions, one seed.
I was planting a carrot seed, an onion seed, and a garlic seed, in a line, just experimenting.
Here's what happened.
I got a 6, rather than 9 onion yield, but an extra onion seed.
I wasn't keeping track of time frames, but this might be a nonrelated occurance. I'll do more research, and update with any useful unformation.
It appears that it was most likely that I simply found the peak of a grow cycle, and got the seed that way. My onion yield has levelled out to 6 on the normal.
I'll still try this some more, though, and look for consistant results.