What’s Blooming in September?
The chart represents the earliest and latest bloom times I have seen around the Twin Cities since I started tracking. Factors such as temperature and precipitation play a large role in how a plant fares year after year. Northern MN should also be a bit later than Southern MN.
Only native plants are listed here. If you are looking for something specific, try the “find in page” feature of your browser (usually CTRL+F).
Reference: chart keys. See also: non-native plant chart, blog field reports and garden escapees.
| Plant name | Week 1 | Week 2 | Week 3 | Week 4 |
|---|---|---|---|---|
| Ambrosia artemisiifolia Common Ragweed | f | f | g | |
| Ambrosia trifida Giant Ragweed | f | f | g | |
| Agalinis tenuifolia Slender-leaf False Foxglove | f | g | ||
| Agastache foeniculum Blue Giant Hyssop | f | f | f | f |
| Ageratina altissima White Snakeroot | f | f | f | f |
| Apios americana Groundnut | f | g | ||
| Artemisia campestris Field Sagewort | f | f | f | g |
| Asclepias tuberosa Butterfly-weed | f | g | ||
| Bidens cernua Nodding Bur-marigold | f | f | f | g |
| Bidens coronata Crowned Beggar-ticks | f | f | g | |
| Calystegia sepium Hedge Bindweed | f | g | ||
| Campanula rotundifolia Harebell | f | f | g | |
| Chelone glabra White Turtlehead | f | g | ||
| Cicuta bulbifera Bulblet-bearing Water Hemlock | f | g | ||
| Cirsium discolor Field Thistle | f | g | ||
| Doellingeria umbellata Flat-topped White Aster | f | f | f | g |
| Echinocystis lobata Wild Cucumber | f | g | ||
| Eupatorium altissimum Tall Boneset | f | f | f | f |
| Eupatorium maculatum Spotted Joe-pye Weed | f | f | g | |
| Eupatorium perfoliatum Boneset | f | f | f | f |
| Euphorbia corollata Flowering Spurge | g | |||
| Eurybia macrophylla Large-leaved Aster | f | f | f | f |
| Galium tinctorium Stiff Marsh Bedstraw | f | f | f | g |
| Gentiana andrewsii Bottle Gentian | f | f | g | |
| Grindelia squarrosa Curlycup Gumweed | f | f | f | g |
| Helenium autumnale Sneezeweed | f | f | f | f |
| Helianthus giganteus Giant Sunflower | f | f | g | |
| Helianthus pauciflorus Stiff Sunflower | f | g | ||
| Helianthus petiolaris Prairie Sunflower | f | f | g | |
| Helianthus tuberosus Jerusalem Artichoke | f | f | f | f |
| Heliopsis helianthoides Smooth Oxeye | f | f | f | f |
| Heterotheca villosa Hairy False Goldenaster | f | f | f | f |
| Impatiens capensis Spotted Touch-me-not | f | f | f | g |
| Lactuca canadensis Wild Lettuce | f | f | g | |
| Lespedeza capitata Round-headed Bush Clover | g | |||
| Liatris aspera Rough Blazing Star | f | g | ||
| Lobelia siphilitica Great Blue Lobelia | f | f | f | f |
| Lycopus americanus American Water Horehound | g | |||
| Lycopus uniflorus Northern Bugleweed | g | |||
| Mentha arvensis Wild Mint | g | |||
| Oenothera biennis Common Evening Primrose | f | f | f | g |
| Oxalis stricta Common Yellow Oxalis | f | f | f | f |
| Pedicularis lanceolata Swamp Lousewort | f | g | ||
| Penthorum sedoides Ditch Stonecrop | g | |||
| Physostegia virginiana Obedient Plant | f | g | ||
| Polygonum amphibium Swamp Smartweed | f | f | g | |
| Prenanthes alba White Rattlesnake-root | f | f | f | g |
| Sicyos angulatus Bur Cucumber | f | g | ||
| Solidago canadensis Canada Goldenrod | f | f | g | |
| Solidago flexicaulis Zigzag Goldenrod | f | f | f | g |
| Solidago nemoralis Gray Goldenrod | f | f | f | g |
| Solidago rigida Stiff Goldenrod | f | f | g | |
| Solidago speciosa Showy Goldenrod | b | f | f | g |
| Spiraea tomentosa Steeplebush | g | |||
| Symphyotrichum novae-angliae New England Aster | f | f | f | f |
| Symphyotrichum oolentangiense Sky-blue Aster | f | f | f | f |
| Symphyotrichum puniceum Purple-stem Aster | f | f | f | g |
| Symphyotrichum sericeum Silky Aster | f | f | f | f |
| Vernonia fasciculata Prairie Ironweed | g |
