| 2026-09-01 | Plants that have been around on Earth for 375+ million years |
| 2025-05-18 | Maidenhair and others |
| 2023-04-18 | Some office plants |
| 2021-06-20 | Water clover and adder's-tongue |
| 2020-12-09 | "Between Two ___" (Zach Galifianakis show) |
| 2020-11-16 | Some greenery on forest floors |
| 2020-01-31 | Some jungle greenery |
| 2019-05-10 | Some office greenery |
| 2016-02-07 | Maidenhair and others |
| 2013-06-09 | Some woods greenery |
| 2012-04-15 | Forest specimens |
| 2012-01-21 | Fiddlehead sources |
| 2001-10-21 | Flowerless plants |
| 1999-01-05 | Flowerless plants |
| 1995-07-03 | Seedless plants |
| 1995-04-03 | Plants with fronds |