See Must Have Perennials

Tried and Tested

All Must Have Perennials® plant introductions go through rigorous trials for quality and reliability testing at secure trial sites worldwide prior to introduction. Only those which prove to be genuinely garden worthy make it into commercial production. Our perennial flowers are also trialed at universities and botanic gardens, which provides valuable information on regional performance. See Must Have Perennials here:


Cal Poly State University
San Luis Obispo, CA

Center for Urban Horticulture
Seattle, WA

Clemson University Department of Horticulture
Clemson, SC

Colorado State University
Fort Collins, CO

Iowa State University – Reiman Garden
Ames, IA Ohio

Ohio State University
Columbus, OH

Oregon State University
Corvallis, OR

Penn State University Landisville Variety Trials at SEAREC
Manheim, PA

Temple University
Ambler, PA


Chicago Botanic Garden
Glencoe, IL

Cincinnati Zoo & Botanical Garden
Cincinnati, OH

Cleveland Botanical Garden
Cleveland, OH

Dallas Arboretum
Dallas, TX

Denver Botanic Gardens
Denver, CO

Greater Des Moines Botanical Garden
Des Moines, IA

Massachusetts Horticultural Society
Elm Bank Horticultural Center
Wellesley, MA

Missouri Botanical Garden
St. Louis, MO

Powell Gardens
Kingsville, MO

Royal Botanical Gardens
Burlington, Ontario, Canada

Secrest Arboretum
Wooster, OH

U. S. Botanic Garden
Washington, DC

Yew Dell Gardens
Crestwood, KY