Holarctic

  • Design

    Coreopsis You Can Count On!

    A while back—27 years, to be exact—the Chicago Botanic Garden created a garden solely to compare perennials, and coreopsis was one of the inaugural trials. We tested mostly seed-grown cultivars of…

  • Article

    Regional Picks: Tough Roadside Plants – Southeast

    1. Blue Mistflower Name: Conoclinium coelestinum (syn. Eupatorium coelestinum) USDA Hardiness Zones: 5 to 11 Size: Up to 3 feet tall and wide Conditions: Full sun to partial shade; average,…

  • Design

    Coneflowers: The Best of the Best

    When I started teaching horticulture in the 1980s, there was a love affair going on with coneflowers (Echinacea spp. and cvs.). There were a handful of tried-and-true cultivars to choose…