BUR
| Date | Clue |
|---|---|
| 2022-01-24 | Prickly seedcase |
| 2021-01-24 | Prickly covering of a seed |
| 2019-08-02 | Prickly husk |
| 2013-09-01 | Prickly sticker |
| 2012-02-16 | Prickly seedcase |
| 2011-06-19 | Sticky seedcase |
| 2011-04-24 | Seedcase that inspired Velcro |
| 2007-11-20 | Prickly husk |
| 2007-03-12 | Prickly seed cover |
| 2006-08-03 | Nut case |
| 2006-05-07 | Forest sticker |
| 2004-03-07 | Sticker |
| 2003-04-01 | Prickly husk |
| 2002-07-12 | Sticker |
| 2001-09-25 | Plant sticker |
| 2001-02-28 | Prickly seedcase |
| 2000-03-10 | Clingy seedpod |