Same problem here, 295 days later. Is this is a gardening problem or a Juno problem?
(Specifically, she has gardening 75. Maxed out garden with tools went from 11 to 14 production when she reached skill 26, but hasn't changed since. I did a really tedious save slum to see if she was just broken at the 51-74 range & it seems it's just broken. Same question remain though, is it Juno or Gardening skill that doesn't work well?)