Farmers raise CHICKs
Farmers work the GROUND
Farmers plant in SPRING
Farmers' crops benefit from WORMs
....
Farmers might try to kill MOLEs
Farmers raise liveSTOCK
Is farmer trying to get us to think along lines of different professions? If so, DOCTOR and LAWYER come into play too. Not my first thought though.
A farmer:
Has a green THUMB
Plants crops in the GROUND during the SPRING
Raises CHICKs and liveSTOCK (the latter often have ear TAGs)
Hopes for rainDROPs
Pre-spoilers, my top five are GROUND, SPRING, CHICK, STOCK, THUMB
After spoilers: yeah, I thought of WORMs and MOLEs, but I think those are more a concern in home lawns and gardens than large scale agriculture.
I'm less enthusiastic on THUMB after it wasn't mentioned by JR4 or Brick; maybe DROP for a fifth word? Or WORM, which would be helpful to organic and low-till farmers?
Edit: it's worth considering that Lewwyn has spent a lot of time in China, where farming is not as industrialized as in the US, and the primary crop is rice. My bias is midwestern US, where the primary crops are corn and soybeans. Things are much different in California, where they grow grapes and almonds.