Herbaceous Perennials

  • Asclepias tuberosa - Butterfly weed

    Published on April 12, 2017

    Several species of milkweed, or asclepias, are native to North America, and this year the Perennial Plant Association has chosen one of them as Perennial Plant of the Year: Asclepias tuberosa.

  • Juvenility in perennials

    Published on June 29, 2016

    Plants started by seed have a juvenile phase and they must develop to a certain maturity before they attain the capacity to flower.

  • Controlling flowering of Echinacea

    Published on February 8, 2013

    Research-based information is presented about how to control the flowering of purple coneflower (Echinacea) for commercial production.

  • Long-day perennials

    Published on March 12, 2012

    One of the major flowering triggers of herbaceous perennials is exposure to long days (short nights). Learn which crops have this response, and tips on how to deliver long-day lighting..

  • Grow perennials with your annuals

    Published on December 29, 2010

    Research at Michigan State University has determined the flowering requirements of more than 600 cultivars and species of herbaceous perennials.