These perennials will withstand temperatures all the way to Zone 3.
- Achillea (Yarrow)
- Aconitum (Monkshood)
- Anaphalis (Pearly Everlasting)
- Anthemis (Golden Marguerite)
- Aquilegia (Columbine)
- Artemisia
- Aruncus (Goatsbeard)
- Astilbe (Spirea)
- Baptisia (False Blue Indigo)
- Bergenia (Pig Squeak)
- Brunnera (Siberian Bugloss)
- Campanula (Bell Flower)
- Centaurea (Cornflower)
- Cerastium (Snow in Summer)
- Clematis
- Convallaria (Lily of the Valley)
- Coreopsis (Tickseed)
- Delphinium (Larkspur)
- Dianthus (Pinks)
- Dicentra (Bleeding Heart)
- Echinacea (Purple Coneflower)
- Filipendula (Meadowsweet)
- Gaillardia (Blanket Flowers)
- Gypsophila (Baby's Breath)
- Heliopsis (False Sunflower)
- Hemerocallis (Daylily)
- Heuchera (Coral Bells)
- Hosta (Plantain Lily)
- Iris
- Lamium (Dead Nettle)
- Limonium (Sea Lavender)
- Lysimachia (Loosestrife)
- Malva (Mallow)
- Nepeta (Catmint)
- Oenothera (Evening Primrose)
- Papaver (Poppy)
- Phlox (Garden Phlox)
- Physostegia (Obedient Plant)
- Platycodon (Balloon Flower)
- Polygonatum (Solomon's Seal)
- Pulmonaria (Lungwort)
- Rudbeckia (Gloriosa Daisy)
- Saponaria (Soapwort)
- Scabiosa (Pincushion Flower)
- Sempervivum (Hens and Chicks)
- Trollius (Globe Flower)
- Veronica (Speedwell)
- Veronicastrum (Culvers Root)