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.