Grace Ditch of Tree133 prepares a large American elm for macro-infusion to protect against Dutch elm disease, a vascular wilt pathogen. Photo courtesy of Craig Bachmann. Plant health care (PHC) is evolving. What was once often approached as [...]

Photo by Rene Notenbomer/iStock In Part I of this series on the application of biochar into urban soils (published in the March 2026 issue), we discussed how research science clearly supports biochar as a powerful soil enhancement. However, [...]