Originally posted by Trakehner:

Originally posted by jonnin:

yes, you either need luck to get a fair number of wild seeds or patience. I think it takes about 20 (game) days to get a 50 plant farm up and running.

What?!?

I started with 3 seeds. I now have a full field of onions after just 5 in-game days.

It takes ~3.5 in-game days to grow an onion, and ~3.5 in-game days to grow a seed onion, so, unless you have mods, I can't see how you could have achieved that.

9 seeds after 7 days. 27 seeds after 14 days. 81 seeds after 21 days.

That roughly matches what jonnin said, and corresponds to my experience too.