Historical clue formulations

• Cup-shaped flower — 2025-12-09
• Subject of an annual festival in the Netherlands — 2024-05-01
• Staple of Dutch Golden Age art — 2022-10-09
• Fluorescent bulb, maybe — 2021-01-02
• Dutch export — 2018-03-07
• ___ bulb — 2018-02-11
• A white one is said to symbolize "I'm sorry" — 2016-05-26
• Subject of an annual festival in Holland, Mich. — 2016-05-22
• Black flower in a Dumas title — 2016-02-23
• Dutch bloom — 2015-11-16
• Dutch pot contents — 2015-05-10
• Flower that symbolizes paradise on earth — 2014-10-05
• Dutch bloom — 2012-01-09
• Flower named for its resemblance to a turban — 2011-12-23
• Flower from Holland — 2011-07-25
• Dutch bloom — 2011-02-07
• White item in a 1944 Matisse painting — 2010-03-20
• Dutch beauty — 2008-05-08
• Onetime Dutch fad item — 2005-09-26
• ___ tree — 2004-05-08
• Dutch bloom — 2003-09-08
• Kind of bulb — 2003-02-20
• Dutch export — 2002-10-19
• Dutch bloomer — 2002-07-02
• Mania source of the 1630's — 2001-11-17
• Dutch bulb — 2001-03-12
• Subject of an annual festival in Holland, Mich. — 2000-10-08
• Garden bulb — 1999-07-05
• ___ tree (Indiana state tree) — 1999-02-28
• Garden bulb — 1997-12-02
• Sign of spring — 1996-12-19
• Spring perennial — 1995-11-19
• Dutch still-life subject — 1995-11-12
• ____ tree (white wood source) — 1995-11-03
• Dutch export — 1995-06-21
• Garden bulb — 1995-01-31
• Haarlem bloomer — 1994-10-06
• Dumas's "The Black _____" — 1994-01-23