Wildflowers Blooming in Pennsylvania in August (60 Species)

60 wildflowers were recorded blooming in Pennsylvania in August in our iNaturalist sample; 20 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 Nov

Top wildflowers in August

Common Jewelweed331 obs.

Cardinal Flower283 obs.

Allegheny monkeyflower239 obs.

American hog-peanut228 obs.

Purple Loosestrife199 obs.

Asiatic dayflower196 obs.

Wingstem154 obs.

White Snakeroot153 obs.

Wild Carrot152 obs.

Great Blue Lobelia151 obs.

Flat-Topped Goldenrod147 obs.

Cutleaf Coneflower127 obs.

All wildflowers blooming in Pennsylvania in August

#	Species	Scientific name	Family	Obs.	Peak in state
1	Common Jewelweed	Impatiens capensis	balsam family	331	Sep (rising)
2	Cardinal Flower	Lobelia cardinalis	bellflower family	283	Aug (peak)
3	Allegheny monkeyflower	Mimulus ringens	lopseed family	239	Jul (past peak)
4	American hog-peanut	Amphicarpaea bracteata	Legumes	228	Aug (peak)
5	Purple Loosestrife	Lythrum salicaria	lythrum family	199	Aug (peak)
6	Asiatic dayflower	Commelina communis	Spiderworts	196	Aug (peak)
7	Wingstem	Verbesina alternifolia	Sunflowers, Daisies, Asters, and Allies	154	Sep (rising)
8	White Snakeroot	Ageratina altissima	Sunflowers, Daisies, Asters, and Allies	153	Sep (rising)
9	Wild Carrot	Daucus carota	carrot family	152	Jul (past peak)
10	Great Blue Lobelia	Lobelia siphilitica	bellflower family	151	Sep (rising)
11	Flat-Topped Goldenrod	Euthamia graminifolia	Sunflowers, Daisies, Asters, and Allies	147	Sep (rising)
12	Cutleaf Coneflower	Rudbeckia laciniata	Sunflowers, Daisies, Asters, and Allies	127	Aug (peak)
13	Pale Jewelweed	Impatiens pallida	balsam family	126	Sep (rising)
14	Naked-Flowered Tick-Trefoil	Hylodesmum nudiflorum	Legumes	121	Aug (peak)
15	Chicory	Cichorium intybus	Sunflowers, Daisies, Asters, and Allies	119	Jul (past peak)
16	black-eyed Susan	Rudbeckia hirta	Sunflowers, Daisies, Asters, and Allies	115	Jul (past peak)
17	brown-eyed Susan	Rudbeckia triloba	Sunflowers, Daisies, Asters, and Allies	113	Sep (rising)
18	Virgin's-Bower	Clematis virginiana	buttercup family	110	Aug (peak)
19	Common Boneset	Eupatorium perfoliatum	Sunflowers, Daisies, Asters, and Allies	105	Aug (peak)
20	Indian tobacco	Lobelia inflata	bellflower family	98	Jul (past peak)
21	Swamp Rose Mallow	Hibiscus moscheutos	Mallow and Hibiscus Family	89	Aug (peak)
22	Panicled Hawkweed	Hieracium paniculatum	Sunflowers, Daisies, Asters, and Allies	88	Aug (peak)
23	Bird's-Foot Trefoil	Lotus corniculatus	Legumes	79	Jun (past peak)
24	Trailing Fuzzy-Bean	Strophostyles helvola	Legumes	79	Aug (peak)
25	Partridge Pea	Chamaecrista fasciculata	Legumes	77	Aug (peak)
26	Rosepink	Sabatia angularis	gentian family	76	Jul (past peak)
27	Swamp Milkweed	Asclepias incarnata	Dogbane Family	75	Jul (past peak)
28	American groundnut	Apios americana	Legumes	72	Aug (peak)
29	Bull Thistle	Cirsium vulgare	Sunflowers, Daisies, Asters, and Allies	71	Aug (peak)
30	Carolina horsenettle	Solanum carolinense	nightshade family	70	Jul (past peak)
31	Pearly Everlasting	Anaphalis margaritacea	Sunflowers, Daisies, Asters, and Allies	67	Aug (peak)
32	Blue Vervain	Verbena hastata	Verbena Family	67	Jul (past peak)
33	Common Toadflax	Linaria vulgaris	Plantain Family	64	Jul (past peak)
34	Common Hibiscus	Hibiscus syriacus	Mallow and Hibiscus Family	62	Aug (peak)
35	Ghost Pipe	Monotropa uniflora	heath family	61	Jul (past peak)
36	Common Selfheal	Prunella vulgaris	Mint Family	61	Jul (past peak)
37	Fall Phlox	Phlox paniculata	phlox family	60	Sep (rising)
38	Japanese knotweed	Reynoutria japonica	knotweed family	60	Aug (peak)
39	American pokeweed	Phytolacca americana	Pokeweed Family	56	Jul (past peak)
40	White Wood Aster	Eurybia divaricata	Sunflowers, Daisies, Asters, and Allies	54	Sep (rising)
41	Common Sneezeweed	Helenium autumnale	Sunflowers, Daisies, Asters, and Allies	52	Sep (rising)
42	Blue Curls	Trichostema dichotomum	Mint Family	52	Aug (peak)
43	Pickerelweed	Pontederia cordata	Pickerelweeds	51	Jul (past peak)
44	Bittersweet Nightshade	Solanum dulcamara	nightshade family	48	Jun (past peak)
45	Wild Bergamot	Monarda fistulosa	Mint Family	48	Jul (past peak)
46	White Meadowsweet	Spiraea alba	rose family	48	Jul (past peak)
47	Porcelain Berry	Ampelopsis glandulosa	Grape Family	47	Aug (peak)
48	Purple Crownvetch	Securigera varia	Legumes	45	Jun (past peak)
49	Butterfly Milkweed	Asclepias tuberosa	Dogbane Family	43	Jul (past peak)
50	Flowering Spurge	Euphorbia corollata	Spurge Family	43	Aug (peak)