Monarch butterflies overwintering at Cerro Pelon Sanctuary, Mexico.

Monarch butterflies overwintering at Cerro Pelon Sanctuary, Mexico. Photo: Pato Moreno

Feature story

Monarch Winter 2020–21 Population Numbers Released Arboretum News

According to newly released data, the population of monarch butterflies in Mexico wintering sites decreased by 26 percent over last winter. On February 25, 2021, the World Wildlife Fund-Telmex Telcel…

Recent posts

Spring Welcome: New Staff at the Arboretum Arboretum News

Robin Zander

The Arboretum is pleased to welcome three new staff members to its administrative, land care, and research units. Robin Zander started as the financial specialist in January. She…

Photo of Karen Oberhauser, UW–Madison Arboretum director

Director's Note, March 2021 Arboretum News

For most of my career, a big part of my job was advising undergraduate and graduate students in the fields of conservation sciences. Every spring, I taught conservation biology, a…

Dwarf bush honeysuckle with two-spotted bumble bee

Gardening with Native Plants: Trees and Shrubs Arboretum News

Despite the possibility of snow or ice storms this month, gardeners anticipate March. We note longer days, increasing sun angles, the equinox, shrinking snowpack, and the early stages of mud…