Wildflowers Blooming in Washington in September (60 Species)

60 wildflowers were recorded blooming in Washington 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 Everlasting376 obs.

Fireweed212 obs.

Fringed Grass of Parnassus134 obs.

Lewis' monkeyflower122 obs.

Mountain Bog Gentian109 obs.

Common Jewelweed100 obs.

Rubber Rabbitbrush88 obs.

Threeleaf Foamflower77 obs.

Common Yarrow76 obs.

Herb Robert73 obs.

Red Clover65 obs.

Common Cat's-ear65 obs.

All wildflowers blooming in Washington in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	376	Aug (past peak)
2	Fireweed	Chamaenerion angustifolium	evening primrose family	212	Jul (past peak)
3	Fringed Grass of Parnassus	Parnassia fimbriata	staff-vine family	134	Aug (past peak)
4	Lewis' monkeyflower	Erythranthe lewisii	lopseed family	122	Aug (past peak)
5	Mountain Bog Gentian	Gentiana calycosa	gentian family	109	Aug (past peak)
6	Common Jewelweed	Impatiens capensis	balsam family	100	Aug (past peak)
7	Rubber Rabbitbrush	Ericameria nauseosa	Sunflowers, Daisies, Asters, and Allies	88	Sep (peak)
8	Threeleaf Foamflower	Tiarella trifoliata	saxifrage family	77	Jul (past peak)
9	Common Yarrow	Achillea millefolium	Sunflowers, Daisies, Asters, and Allies	76	Jul (past peak)
10	Herb Robert	Geranium robertianum	Geranium family	73	May (past peak)
11	Red Clover	Trifolium pratense	Legumes	65	Jun (past peak)
12	Common Cat's-ear	Hypochaeris radicata	Sunflowers, Daisies, Asters, and Allies	65	Jun (past peak)
13	European Searocket	Cakile maritima	mustard family	60	Aug (past peak)
14	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	57	Jul (past peak)
15	Common Tansy	Tanacetum vulgare	Sunflowers, Daisies, Asters, and Allies	50	Aug (past peak)
16	Purple Loosestrife	Lythrum salicaria	lythrum family	47	Aug (past peak)
17	Ragwort	Jacobaea vulgaris	Sunflowers, Daisies, Asters, and Allies	46	Jul (past peak)
18	Nodding Beggarticks	Bidens cernua	Sunflowers, Daisies, Asters, and Allies	44	Sep (peak)
19	Common Selfheal	Prunella vulgaris	Mint Family	43	Jul (past peak)
20	Wild Carrot	Daucus carota	carrot family	41	Jul (past peak)
21	Butterfly bush	Buddleja davidii	figwort family	39	Jul (past peak)
22	Bull Thistle	Cirsium vulgare	Sunflowers, Daisies, Asters, and Allies	37	Jul (past peak)
23	White Clover	Trifolium repens	Legumes	34	Jun (past peak)
24	Purple Foxglove	Digitalis purpurea	Plantain Family	32	Jun (past peak)
25	Bittersweet Nightshade	Solanum dulcamara	nightshade family	31	Aug (past peak)
26	Field Bindweed	Convolvulus arvensis	bindweed family	29	Jun (past peak)
27	Creeping Thistle	Cirsium arvense	Sunflowers, Daisies, Asters, and Allies	27	Jul (past peak)
28	Rose Spirea	Spiraea douglasii	rose family	26	Jul (past peak)
29	Yellow Sand Verbena	Abronia latifolia	four o'clock family	24	May (past peak)
30	Broad-Leaved Sweet Pea	Lathyrus latifolius	Legumes	24	Jul (past peak)
31	California poppy	Eschscholzia californica	Poppy Family	23	May (past peak)
32	Spotted Knapweed	Centaurea stoebe	Sunflowers, Daisies, Asters, and Allies	22	Aug (past peak)
33	Pacific Bleeding Heart	Dicentra formosa	Poppy Family	21	May (past peak)
34	Lawn daisy	Bellis perennis	Sunflowers, Daisies, Asters, and Allies	21	Apr (past peak)
35	Common St. John's Wort	Hypericum perforatum	St. John's wort family	19	Jul (past peak)
36	Common Sunflower	Helianthus annuus	Sunflowers, Daisies, Asters, and Allies	18	Sep (peak)
37	Great Mullein	Verbascum thapsus	figwort family	18	Jul (past peak)
38	Japanese knotweed	Reynoutria japonica	knotweed family	18	Sep (peak)
39	Horseweed	Erigeron canadensis	Sunflowers, Daisies, Asters, and Allies	17	Aug (past peak)
40	Oxeye Daisy	Leucanthemum vulgare	Sunflowers, Daisies, Asters, and Allies	15	Jun (past peak)
41	Common Soapwort	Saponaria officinalis	pink family	15	Aug (past peak)
42	Common Snowberry	Symphoricarpos albus	honeysuckle family	13	Jun (past peak)
43	Candy Flower	Claytonia sibirica	Pussypaw Family	13	Apr (past peak)
44	Dwarf Mallow	Malva neglecta	Mallow and Hibiscus Family	13	Sep (peak)
45	Dwarf Fireweed	Chamaenerion latifolium	evening primrose family	13	Aug (past peak)
46	Salal	Gaultheria shallon	heath family	12	Jun (past peak)
47	White Sweetclover	Melilotus albus	Legumes	12	Jul (past peak)
48	Bird's-Foot Trefoil	Lotus corniculatus	Legumes	11	Aug (past peak)
49	Redstem Stork's-bill	Erodium cicutarium	Geranium family	11	Apr (past peak)
50	Ribwort Plantain	Plantago lanceolata	Plantain Family	11	Jun (past peak)