Historical clue formulations

• Prickly patch — 2026-04-12
• Prickly plant in a thicket — 2023-06-19
• Patch growth — 2021-01-23
• Bramble — 2019-09-16
• Bramble — 2013-11-11
• Canadian curling championship, with "the" — 2010-08-15
• Prickly plant — 2010-06-02
• Rabbit's home, maybe — 2008-10-26
• Kind of patch — 2007-05-13
• Pipe — 2002-01-05
• Thorny patch — 2000-04-21
• Pipe type — 1999-08-07