Historical clue formulations

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