Okay, so I live in the swamp, where it's hard to grow onions. Acid soil, and all that. The onion quest sat there in my questventory for frekin ever, until I found a friend with a vanilla house who let me grow some onions. Ta-daa! Sweet sweetness!
But now, I think there's supposed to be a potato quest, and the rock won't give it to me! I have Gardening 1-4 and Croppery 1-3, but alas. Is there some secret requirement to get the next cropping quest? Or is my magic rock just a huge tease?