1. Extremely Cold Hardy Perennials
Achillea
Adenophora
Aegopodium
Ajuga
Alcea
Alchemilla
Amsonia
Anchusa
Anenome sylvestris
Anthemis
Aquilegia
Arabis
Armeria
Artemisia
Aruncus
Asclepias
Aster
Aurinia
Baptisia australis
Bergenia
Brunnera
Campanula
Cerastium
Convallaria
Delphinium
Dicentra
Echinops
Eupatorium
Athyrium
Matteuccia
Gaillardia
Chasmanthium latifolium
Helictotrichon
Phalaris
Schizachyrium
Sporobolus
Gypsophila
Heliopsis
Hemerocallis
Hosta
Houttuynia
Iberis
Tall Bearded Iris
Siberian Iris
Lamium
Lathyrus
Liatris
Lobelia cardinalis
Lychnis
Myosotis
Nepeta
Oenothera missouriensis
Garden Peony
Papaver
Penstemon
Phlox subulata
Platycodon
Polemonium
Polygonatum
Pulmonaria
Salvia
Saponaria
Sedum
Sempervivum
Tanacetum
Thalictrum
Thymus
Tradescantia
Trollius
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Brunnera
Alcea
Hosta
Delphinium
Garden Peony
Where perennial lovers go for good dirt.
Hardy to Zone 3 (-40°F) or colder
Papaver