https://thedailygardener.org/otb20190904/
Alfred Rehder: The Dendrologist Who Shaped the USDA Hardiness Zones - The Daily Gardener Podcast
Sep 18, 2025 - The Arnold Arboretum Taxonomist Today is the birthday of the Arnold Arboretum taxonomist and dendrologist Alfred Rehder, who was born on this day in
usda hardiness zonesalfred rehdershapeddailygardener