Wildflowers Blooming in Oregon in September (60 Species)

60 wildflowers were recorded blooming in Oregon in September in our iNaturalist sample; 5 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Top wildflowers in September

Pearly Everlasting176 obs.

Fireweed120 obs.

Rubber Rabbitbrush118 obs.

Nodding Beggarticks71 obs.

Common Jewelweed61 obs.

Ragwort58 obs.

Chicory51 obs.

Wild Carrot48 obs.

European Searocket46 obs.

Bull Thistle41 obs.

Coyote Brush40 obs.

Rose Spirea38 obs.

All wildflowers blooming in Oregon in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	176	Aug (past peak)
2	Fireweed	Chamaenerion angustifolium	evening primrose family	120	Jul (past peak)
3	Rubber Rabbitbrush	Ericameria nauseosa	Sunflowers, Daisies, Asters, and Allies	118	Sep (peak)
4	Nodding Beggarticks	Bidens cernua	Sunflowers, Daisies, Asters, and Allies	71	Sep (peak)
5	Common Jewelweed	Impatiens capensis	balsam family	61	Aug (past peak)
6	Ragwort	Jacobaea vulgaris	Sunflowers, Daisies, Asters, and Allies	58	Jul (past peak)
7	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	51	Jul (past peak)
8	Wild Carrot	Daucus carota	carrot family	48	Jul (past peak)
9	European Searocket	Cakile maritima	mustard family	46	Oct (rising)
10	Bull Thistle	Cirsium vulgare	Sunflowers, Daisies, Asters, and Allies	41	Aug (past peak)
11	Coyote Brush	Baccharis pilularis	Sunflowers, Daisies, Asters, and Allies	40	Sep (peak)
12	Rose Spirea	Spiraea douglasii	rose family	38	Jul (past peak)
13	Herb Robert	Geranium robertianum	Geranium family	36	May (past peak)
14	Common Madia	Madia elegans	Sunflowers, Daisies, Asters, and Allies	33	Jul (past peak)
15	Fringed Grass of Parnassus	Parnassia fimbriata	staff-vine family	33	Aug (past peak)
16	Pennyroyal	Mentha pulegium	Mint Family	32	Jul (past peak)
17	Common Cat's-ear	Hypochaeris radicata	Sunflowers, Daisies, Asters, and Allies	30	Jun (past peak)
18	Pacific Bleeding Heart	Dicentra formosa	Poppy Family	29	Apr (past peak)
19	Broad-Leaved Sweet Pea	Lathyrus latifolius	Legumes	29	Jul (past peak)
20	Mountain Bog Gentian	Gentiana calycosa	gentian family	27	Aug (past peak)
21	Threeleaf Foamflower	Tiarella trifoliata	saxifrage family	26	Jul (past peak)
22	California poppy	Eschscholzia californica	Poppy Family	25	May (past peak)
23	Common Tansy	Tanacetum vulgare	Sunflowers, Daisies, Asters, and Allies	25	Aug (past peak)
24	Common Yarrow	Achillea millefolium	Sunflowers, Daisies, Asters, and Allies	24	Jun (past peak)
25	Common Selfheal	Prunella vulgaris	Mint Family	22	Jun (past peak)
26	Common Soapwort	Saponaria officinalis	pink family	22	Aug (past peak)
27	Creeping Thistle	Cirsium arvense	Sunflowers, Daisies, Asters, and Allies	22	Jul (past peak)
28	Candy Flower	Claytonia sibirica	Pussypaw Family	21	Apr (past peak)
29	Common St. John's Wort	Hypericum perforatum	St. John's wort family	21	Jul (past peak)
30	Great Mullein	Verbascum thapsus	figwort family	21	Jul (past peak)
31	Scarlet Gilia	Ipomopsis aggregata	phlox family	20	Jul (past peak)
32	Lewis' monkeyflower	Erythranthe lewisii	lopseed family	20	Aug (past peak)
33	Western Harebell	Campanula petiolata	bellflower family	19	Jul (past peak)
34	Red Clover	Trifolium pratense	Legumes	18	May (past peak)
35	Field Bindweed	Convolvulus arvensis	bindweed family	18	Jun (past peak)
36	Purple Foxglove	Digitalis purpurea	Plantain Family	18	Jun (past peak)
37	Bittersweet Nightshade	Solanum dulcamara	nightshade family	17	Jul (past peak)
38	Wild Teasel	Dipsacus fullonum	honeysuckle family	17	Jul (past peak)
39	Moth Mullein	Verbascum blattaria	figwort family	17	Jun (past peak)
40	Purple Loosestrife	Lythrum salicaria	lythrum family	17	Aug (past peak)
41	Lawn daisy	Bellis perennis	Sunflowers, Daisies, Asters, and Allies	16	Apr (past peak)
42	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	15	Aug (past peak)
43	Dwarf Mallow	Malva neglecta	Mallow and Hibiscus Family	15	Aug (past peak)
44	Vinegar Weed	Trichostema lanceolatum	Mint Family	14	Aug (past peak)
45	White Clover	Trifolium repens	Legumes	14	May (past peak)
46	Oxeye Daisy	Leucanthemum vulgare	Sunflowers, Daisies, Asters, and Allies	14	May (past peak)
47	Yellow Sand Verbena	Abronia latifolia	four o'clock family	13	Sep (peak)
48	Scarlet Pimpernel	Lysimachia arvensis	primrose family	13	Jun (past peak)
49	Naked Buckwheat	Eriogonum nudum	knotweed family	11	Jul (past peak)
50	Spotted spurge	Euphorbia maculata	Spurge Family	11	Sep (peak)