| 2026-06-29 | Saguaros, e.g. |
| 2025-09-22 | Desert plants with needles |
| 2025-08-04 | Desert plants |
| 2025-06-02 | Prickly plants |
| 2025-03-12 | Parodia and peyote, for two |
| 2023-11-09 | Sights around Joshua Tree National Park |
| 2023-08-02 | Prickly pears, e.g. |
| 2023-03-04 | Plants popular in xeriscaping |
| 2023-02-15 | Mojave flora |
| 2022-10-27 | Saguaros, e.g. |
| 2022-01-20 | Torch thistles, e.g. |
| 2021-12-01 | Peyote and prickly pear |
| 2021-01-27 | Frequent sights in Road Runner cartoons |
| 2021-01-13 | Some drought-resistant plants |
| 2020-08-15 | Landscapers may find them hard to handle |
| 2019-08-08 | Stickers in a plant store |
| 2018-06-15 | Ones sticking around a desert? |
| 2018-04-07 | Scenery features in a Road Runner cartoon |
| 2017-04-11 | Plants with needles |
| 2016-09-16 | Section of a botanical garden |
| 2016-09-12 | You might be stuck with these when traveling in the Southwest |
| 2016-02-03 | Some Arizona flora |
| 2015-11-01 | Homes for Gila woodpeckers |
| 2015-07-29 | Prickly pears, e.g. |
| 2015-04-11 | Some xerophiles |
| 2014-11-23 | Stickers? |
| 2014-04-21 | Southwestern flora |
| 2014-04-03 | Arizona sights |
| 2014-01-27 | Desert flora |
| 2014-01-19 | Dragon fruit plants |
| 2013-08-25 | Peyote and saguaro |
| 2013-08-06 | Desert bloomers |
| 2012-10-18 | They have sticking points |
| 2012-10-08 | Desert plants |
| 2012-09-18 | Prickly plants |
| 2009-11-03 | Gila woodpeckers nest in them |
| 2009-08-23 | Peyotes, e.g. |
| 2009-06-23 | They have many needles |
| 2009-05-18 | Prickly plants |
| 2009-04-26 | Much Arizona flora |
| 2009-01-05 | Desert plants |
| 2008-09-05 | Things with sticking points |
| 2008-08-19 | Desert flora |
| 2006-08-08 | Desert bloomers |
| 2006-07-26 | Desert flora |
| 2006-03-26 | Leafless plants |
| 2005-09-26 | Spiny plants |
| 2005-09-06 | Desert bloomers |
| 2005-06-13 | Desert plants |
| 2005-03-23 | Desert flora |
| 2004-09-28 | Desert flora |
| 2003-10-05 | They connect to points in the Southwest |
| 2002-02-18 | Desert plants |
| 2001-02-27 | Prickly plants |
| 2000-07-30 | Spiny things |
| 1999-12-02 | Mojave vegetation |
| 1999-11-20 | Plants in a dry place |
| 1998-07-20 | Prickly plants |
| 1997-03-05 | Chollas |
| 1997-01-27 | Desert plants |
| 1996-12-24 | Desert flora |
| 1996-08-27 | Places for needles |
| 1996-08-08 | Western plants |
| 1996-06-20 | Mescal and others |
| 1994-09-14 | Big stickers |