Historical clue formulations

• Something green in a greenhouse — 2026-06-08
• Audience member who might be in on the trick — 2025-02-05
• Nursery purchase — 2023-08-06
• - — 2021-05-16
• Confederate in an audience — 2020-01-05
• Nursery buy — 2019-03-26
• Purposely placed evidence — 2018-05-02
• Sow, as seeds — 2018-02-12
• Deliver, as a big kiss — 2015-01-15
• - — 2014-10-09
• Magician's assistant in an audience, say — 2013-08-20
• Place secretly — 2011-04-06
• Mole, e.g. — 2010-10-27
• One that shoots — 2010-06-04
• Factory — 2010-01-26
• Botanist's study — 2009-12-22
• Nursery purchase — 2009-08-11
• Factory — 2009-07-06
• Carnival shill, e.g. — 2008-09-17
• Undercover agent — 2006-03-30
• Mole — 2005-11-04
• Annual, e.g. — 2004-07-09
• Mole, maybe — 2001-01-24
• Many a housewarming gift — 2000-12-23
• Factory — 1999-12-14
• 4-Down, for one — 1999-07-16
• Not legitimate evidence — 1998-08-30
• Infiltrator, perhaps — 1998-05-20
• Manufacturing___ — 1996-06-24
• Insider of a sort — 1995-04-16
• Kind of kingdom — 1994-10-21
• Spy of a sort — 1994-08-12
• C.I.A. mole, perhaps — 1994-02-20