Historical clue formulations

• Like some treated lawns — 2008-01-30
• Like many cared-for lawns — 2007-10-11
• Treated a lawn, perhaps — 2005-10-31
• Like well-cared-for lawns — 2001-12-05
• Did a lawn job — 2000-09-28
• Fertilized, in a way — 1996-06-14