In 2023 a major review by Karst, Jones and Hoeksema argued the field over-read the Mother Tree idea, citing thin field evidence, positive-result citation bias and confounded methods. Simard and colleagues answered with vigorous rebuttals. The episode picks no winner and treats it as a live debate about how science polices its own wonder.
Who's who
- Justine Karst+1 more episodeUniversity of Alberta mycorrhizal ecologist; lead author of the 2023 review
- Melanie Jones+1 more episodeUBC Okanagan biologist; co-author of the 2023 review
- Jason Hoeksema+1 more episodeUniversity of Mississippi biologist; co-author of the 2023 review
- Suzanne Simard+2 more episodesUBC forest ecologist and lead defender of the network narrative
- Tamir KleinWeizmann Institute plant scientist; lead author of the "Facts, not fantasy" defense
Timeline
- 1997Simard and colleagues publish carbon transfer between Douglas-fir and paper birch in Nature
- 2021Simard's memoir Finding the Mother Tree is published
- February 2023Karst, Jones and Hoeksema publish their critique on positive citation bias
- 2023The same authors publish an opinion piece on the perils of plant personification
- 2024Simard, Ryan and Perry publish a point-by-point response in Frontiers in Forests and Global Change
Still debated
Critics say fungal network linkage and seedling benefit are assumed rather than shown, while defenders say Mother Tree was a public metaphor and that converging methods support transfer. Whether citation bias distorted the field, or the critique itself was selective, is also argued.