Historical clue formulations

• Garden toilers — 2018-09-16
• Farmhands, at times — 2010-10-23
• Workers in rows — 2005-10-30
• Work force that turns over a lot — 2005-06-05
• Some field workers — 2003-11-07
• Weed killers — 2002-10-15
• Some farm hands — 2002-06-22
• Weed whackers — 2000-10-25
• Cultivating group? — 2000-01-22
• Tillers — 1996-08-13