Non-native Plant Bloom Times
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 plants alien to Minnesota 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: blog field reports and garden escapees.
| Plant name | Apr | May | Jun | Jul | Aug | Sep | Oct |
|---|---|---|---|---|---|---|---|
| Alliaria petiolata Garlic Mustard | b | g | |||||
| Arctium minus Common Burdock | b | f | g | ||||
| Artemisia absinthium Absinthium | b | g | |||||
| Asparagus officinalis Asparagus | b | g | |||||
| Barbarea vulgaris Garden Yellow Rocket | b | g | |||||
| Berteroa incana Hoary Alyssum | b | f | f | f | f | f | f |
| Campanula rapunculoides Creeping Bellflower | b | f | g | ||||
| Cannabis sativa Hemp | b | f | g | ||||
| Capsella bursa-pastoris Shepherd's Purse | b | f | f | g | |||
| Centaurea stoebe Spotted Knapweed | b | f | f | g | |||
| Cirsium arvense Canada Thistle | b | g | |||||
| Cirsium vulgare Bull Thistle | b | f | g | ||||
| Commelina communis Asiatic Dayflower | b | f | f | g | |||
| Conium maculatum Poison Hemlock | b | g | |||||
| Convallaria majalis European Lily of the Valley | b | g | |||||
| Convolvulus arvensis Field Bindweed | b | f | f | g | |||
| Crepis tectorum Narrow-leaf Hawk's Beard | b | g | |||||
| Cynoglossum officinale Gypsy-flower | g | ||||||
| Erysimum cheiranthoides Wormseed Wallflower | b | g | |||||
| Euphorbia esula Leafy Spurge | b | f | g | ||||
| Galeopsis tetrahit Hemp Nettle | b | g | |||||
| Glechoma hederacea Ground Ivy | b | f | g | ||||
| Hemerocallis fulva Orange Day Lily | b | g | |||||
| Hesperis matronalis Dame's Rocket | b | g | |||||
| Hypericum perforatum Common St. Johnswort | b | f | f | g | |||
| Iris pseudacorus Pale-yellow Iris | g | ||||||
| Leonurus cardiaca Motherwort | b | f | g | ||||
| Leucanthemum vulgare Oxeye Daisy | b | g | |||||
| Linaria vulgaris Butter and Eggs | b | f | f | f | f | ||
| Lotus corniculatus Birds-foot Trefoil | b | f | g | ||||
| Matricaria discoidea Pineapple-weed | b | f | f | f | g | ||
| Medicago lupulina Black Medick | b | f | f | f | g | ||
| Melilotus officinalis Yellow Sweet Clover | b | f | f | g | |||
| Myosoton aquaticum Giant Chickweed | b | f | f | f | f | f | |
| Potentilla recta Sulphur Cinquefoil | b | g | |||||
| Ranunculus acris Tall Buttercup | b | f | g | ||||
| Rumex crispus Curly Dock | b | g | |||||
| Saponaria officinalis Bouncing Bet | b | g | |||||
| Securigera varia Crown Vetch | b | f | g | ||||
| Silene csereii Balkan Catchfly | b | g | |||||
| Silene latifolia White Campion | b | f | f | g | |||
| Sisymbrium altissimum Tall Tumble Mustard | b | g | |||||
| Solanum dulcamara Bittersweet Nightshade | b | f | f | g | |||
| Tanacetum vulgare Common Tansy | b | g | |||||
| Thlaspi arvense Pennycress | b | g | |||||
| Tragopogon dubius Yellow Goat's Beard | b | f | f | f | g | ||
| Trifolium arvense Rabbit-foot Clover | b | f | f | g | |||
| Trifolium hybridum Alsike Clover | b | f | f | g | |||
| Trifolium pratense Red Clover | b | f | f | f | g | ||
| Trifolium repens White Clover | b | f | f | f | f | ||
| Verbascum thapsus Common Mullein | b | g | |||||
| Veronica serpyllifolia Thyme-leaf Speedwell | b | f | f | f | f | f |
