Perennials: Flowering Seasons

Genus Common Name Blooming Time
Achillea Yarrow June-July
Alchemilla Lady’s Mantle June-July
Allium Wild Onion May-Aug
Alcea Hollyhock (biennial) July
Aquilegia Columbine May-June
Arabis Rock Cress April
Asclepias Milkweed; Butterflyweed July
Aster Aster Sept–Oct
Astilbe Astilbe June-Aug
Aurinia Basket-of-Gold April
Baptisia Wild Blue Indigo June
Boltonia Boltonia Aug-Sept
Campanula Bellflower June-July
Chelone Turtlehead Aug-Sept
Clematis Clematis June-Aug
Convallaria Lily of the Valley May
Coreopsis Tickseed July-Sept
Corydalis Fumitory May-Aug
Delphinium Delphinium July-Aug
Dianthus Pinks June-July
Dicentra Bleeding Heart May-June
Dicentra Fringed Bleeding Heart June-Aug
Digitalis Foxglove June-July
Doronicum Leopard’s Bane April-May
Draba Draba April
Echinacea Coneflower July-Sept
Echinops Globe Thistle July-Sept
Eutrochium Joe Pye Weed Sept
Filipendula Meadowsweet July
Gaillardia Blanketflower June-Sept
Geranium Cranesbill June-August
Gypsophila Baby’s Breath July-August
Helenium Helen’s Flower August-Sept
Hemerocallis Daylily July-August
Heuchera Coral Bells June-July
Heliopsis Heliopsis July-Sept
Iberis Candytuft May
Iris Siberian & Bearded Iris June
Iris Japanese Iris July
Leucanthemum Shasta Daisy June-July
Liatris Blazing Star August-Sept
Lilium Asiatic Lily June-July
Lilium Oriental Lily July-August
Limonium Sea Lavender July-August
Mertensia Virginia Bluebells April-May
Monarda Bee Balm July-August
Myosotis Forget-Me-Not May-June
Narcissus Daffodil April-May
Paeonia Peony May-June
Papaver Oriental Poppy June
Penstemon Beardtongue June-August
Perovskia Russian Sage July-August
Phlox Spring Phlox; Summer Phlox May; July-August
Physostegia Obedient Plant August-Sept
Platycodon Balloon Flower August
Polemonium Jacob’s Ladder April-June
Primula Primrose May-June
Pulmonaria Lungwort April-May
Rudbeckia Black-Eyed Susan July-Sept
Sanguinaria Bloodroot April
Scabiosa Pincushion Flower June-August
Sedum Showy Stonecrop August-Sept
Stokesia Stokes Aster July-Sept
Thalictrum Meadow Rue June
Thalictrum Lavender Mist July-August
Tiarella Foamflower May-June
Trollius Globe Flower May-June
Tulipa Species Tulips April-May
Tulipa Hybrid Tulips May-June
Veronica Speedwell June-July

From the GardenPro Answer Book; revised and updated by Lois Berg Stack, Ornamental Horticulture Specialist, University of Maine Cooperative Extension.