Wildflowers Blooming in Delaware in September (60 Species)

60 wildflowers were recorded blooming in Delaware in September in our iNaturalist sample; 23 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.

Feb Mar Apr May Jun Jul Aug Sep Oct

Top wildflowers in September

Common Jewelweed73 obs.

Autumn Clematis43 obs.

Great Blue Lobelia31 obs.

Blue Mistflower24 obs.

White Snakeroot23 obs.

Asiatic dayflower22 obs.

Chicory19 obs.

Downy Lobelia19 obs.

Late Boneset16 obs.

Cardinal Flower15 obs.

Purple Loosestrife14 obs.

Broad-Leaved Goldenrod14 obs.

All wildflowers blooming in Delaware in September

#	Species	Scientific name	Family	Obs.	Peak in state
1	Common Jewelweed	Impatiens capensis	balsam family	73	Sep (peak)
2	Autumn Clematis	Clematis terniflora	buttercup family	43	Sep (peak)
3	Great Blue Lobelia	Lobelia siphilitica	bellflower family	31	Sep (peak)
4	Blue Mistflower	Conoclinium coelestinum	Sunflowers, Daisies, Asters, and Allies	24	Sep (peak)
5	White Snakeroot	Ageratina altissima	Sunflowers, Daisies, Asters, and Allies	23	Sep (peak)
6	Asiatic dayflower	Commelina communis	Spiderworts	22	Sep (peak)
7	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	19	Jul (past peak)
8	Downy Lobelia	Lobelia puberula	bellflower family	19	Sep (peak)
9	Late Boneset	Eupatorium serotinum	Sunflowers, Daisies, Asters, and Allies	16	Sep (peak)
10	Cardinal Flower	Lobelia cardinalis	bellflower family	15	Aug (past peak)
11	Purple Loosestrife	Lythrum salicaria	lythrum family	14	Jul (past peak)
12	Broad-Leaved Goldenrod	Solidago flexicaulis	Sunflowers, Daisies, Asters, and Allies	14	Sep (peak)
13	black-eyed Susan	Rudbeckia hirta	Sunflowers, Daisies, Asters, and Allies	13	Jul (past peak)
14	Japanese honeysuckle	Lonicera japonica	honeysuckle family	13	May (past peak)
15	Tall Goldenrod	Solidago altissima	Sunflowers, Daisies, Asters, and Allies	13	Oct (rising)
16	Flat-Topped Goldenrod	Euthamia graminifolia	Sunflowers, Daisies, Asters, and Allies	11	Sep (peak)
17	Purple Passionflower	Passiflora incarnata	Passionfruit Family	10	Aug (past peak)
18	White Turtlehead	Chelone glabra	Plantain Family	10	Sep (peak)
19	Trailing Fuzzy-Bean	Strophostyles helvola	Legumes	10	Sep (peak)
20	Pale Jewelweed	Impatiens pallida	balsam family	9	Sep (peak)
21	Northern Seaside Goldenrod	Solidago sempervirens	Sunflowers, Daisies, Asters, and Allies	9	Oct (rising)
22	Flower-Of-An-Hour	Hibiscus trionum	Mallow and Hibiscus Family	8	Aug (past peak)
23	Groundsel Tree	Baccharis halimifolia	Sunflowers, Daisies, Asters, and Allies	8	Oct (rising)
24	American hog-peanut	Amphicarpaea bracteata	Legumes	8	Sep (peak)
25	Broadleaf Arrowhead	Sagittaria latifolia	Water-Plantain family	7	Sep (peak)
26	Wild Carrot	Daucus carota	carrot family	7	Jul (past peak)
27	Wingstem	Verbesina alternifolia	Sunflowers, Daisies, Asters, and Allies	7	Sep (peak)
28	Leafy Elephant's-Foot	Elephantopus carolinianus	Sunflowers, Daisies, Asters, and Allies	7	Sep (peak)
29	White Wood Aster	Eurybia divaricata	Sunflowers, Daisies, Asters, and Allies	7	Sep (peak)
30	Citronella Horse Balm	Collinsonia canadensis	Mint Family	7	Sep (peak)
31	Pickerelweed	Pontederia cordata	Pickerelweeds	6	Jun (past peak)
32	Pinkweed	Persicaria pensylvanica	knotweed family	6	Sep (peak)
33	brown-eyed Susan	Rudbeckia triloba	Sunflowers, Daisies, Asters, and Allies	6	Aug (past peak)
34	Ghost Pipe	Monotropa uniflora	heath family	5	Jun (past peak)
35	Red Clover	Trifolium pratense	Legumes	5	May (past peak)
36	Jimsonweed	Datura stramonium	nightshade family	5	Aug (past peak)
37	New England aster	Symphyotrichum novae-angliae	Sunflowers, Daisies, Asters, and Allies	5	Sep (peak)
38	Saltmarsh mallow	Kosteletzkya pentacarpos	Mallow and Hibiscus Family	5	Aug (past peak)
39	White Morning-glory	Ipomoea lacunosa	bindweed family	5	Sep (peak)
40	Porcelain Berry	Ampelopsis glandulosa	Grape Family	5	Jul (past peak)
41	Carolina horsenettle	Solanum carolinense	nightshade family	4	Jun (past peak)
42	Marsh Fleabane	Pluchea odorata	Sunflowers, Daisies, Asters, and Allies	4	Aug (past peak)
43	Field Thistle	Cirsium discolor	Sunflowers, Daisies, Asters, and Allies	4	Aug (past peak)
44	Swamp Rose Mallow	Hibiscus moscheutos	Mallow and Hibiscus Family	4	Aug (past peak)
45	Cutleaf Coneflower	Rudbeckia laciniata	Sunflowers, Daisies, Asters, and Allies	4	Aug (past peak)
46	Bluestem Goldenrod	Solidago caesia	Sunflowers, Daisies, Asters, and Allies	4	Oct (rising)
47	Common Hibiscus	Hibiscus syriacus	Mallow and Hibiscus Family	4	Jul (past peak)
48	Blue Curls	Trichostema dichotomum	Mint Family	4	Sep (peak)
49	Perennial Wooly Bean	Strophostyles umbellata	Legumes	4	Aug (past peak)
50	American pokeweed	Phytolacca americana	Pokeweed Family	3	Jul (past peak)