60 wildflowers were recorded blooming in Delaware in October in our iNaturalist sample; 9 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in October

White Snakeroot

Northern Seaside Goldenrod
Chicory

Tall Goldenrod
Bluestem Goldenrod
Groundsel Tree

Common Wrinkle-Leaved Goldenrod

Common Jewelweed
Japanese honeysuckle

Blue Mistflower

Broad-Leaved Goldenrod

Great Blue Lobelia
All wildflowers blooming in Delaware in October
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | White Snakeroot | Ageratina altissima | Sunflowers, Daisies, Asters, and Allies | 22 | Sep (past peak) |
| 2 | Northern Seaside Goldenrod | Solidago sempervirens | Sunflowers, Daisies, Asters, and Allies | 18 | Oct (peak) |
| 3 | Chicory | Cichorium intybus | Sunflowers, Daisies, Asters, and Allies | 16 | Jul (past peak) |
| 4 | Tall Goldenrod | Solidago altissima | Sunflowers, Daisies, Asters, and Allies | 14 | Oct (peak) |
| 5 | Bluestem Goldenrod | Solidago caesia | Sunflowers, Daisies, Asters, and Allies | 12 | Oct (peak) |
| 6 | Groundsel Tree | Baccharis halimifolia | Sunflowers, Daisies, Asters, and Allies | 11 | Oct (peak) |
| 7 | Common Wrinkle-Leaved Goldenrod | Solidago rugosa | Sunflowers, Daisies, Asters, and Allies | 10 | Oct (peak) |
| 8 | Common Jewelweed | Impatiens capensis | balsam family | 9 | Sep (past peak) |
| 9 | Japanese honeysuckle | Lonicera japonica | honeysuckle family | 9 | May (past peak) |
| 10 | Blue Mistflower | Conoclinium coelestinum | Sunflowers, Daisies, Asters, and Allies | 7 | Sep (past peak) |
| 11 | Broad-Leaved Goldenrod | Solidago flexicaulis | Sunflowers, Daisies, Asters, and Allies | 7 | Sep (past peak) |
| 12 | Great Blue Lobelia | Lobelia siphilitica | bellflower family | 7 | Sep (past peak) |
| 13 | Ghost Pipe | Monotropa uniflora | heath family | 6 | Jun (past peak) |
| 14 | Common Toadflax | Linaria vulgaris | Plantain Family | 5 | Oct (peak) |
| 15 | American Witch-Hazel | Hamamelis virginiana | witch-hazel family | 5 | Oct (peak) |
| 16 | Common Selfheal | Prunella vulgaris | Mint Family | 5 | Jul (past peak) |
| 17 | Downy Lobelia | Lobelia puberula | bellflower family | 5 | Sep (past peak) |
| 18 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 4 | Jul (past peak) |
| 19 | Autumn Clematis | Clematis terniflora | buttercup family | 4 | Sep (past peak) |
| 20 | Low Smartweed | Persicaria longiseta | knotweed family | 4 | Oct (peak) |
| 21 | Asiatic dayflower | Commelina communis | Spiderworts | 3 | Sep (past peak) |
| 22 | White Clover | Trifolium repens | Legumes | 3 | May (past peak) |
| 23 | White Turtlehead | Chelone glabra | Plantain Family | 3 | Sep (past peak) |
| 24 | Fall Phlox | Phlox paniculata | phlox family | 3 | Aug (past peak) |
| 25 | Common Dandelion | Taraxacum officinale | Sunflowers, Daisies, Asters, and Allies | 2 | Apr (past peak) |
| 26 | Cardinal Flower | Lobelia cardinalis | bellflower family | 2 | Aug (past peak) |
| 27 | American pokeweed | Phytolacca americana | Pokeweed Family | 2 | Jul (past peak) |
| 28 | Pinkladies | Oenothera speciosa | evening primrose family | 2 | May (past peak) |
| 29 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 2 | Jun (past peak) |
| 30 | Late Boneset | Eupatorium serotinum | Sunflowers, Daisies, Asters, and Allies | 2 | Sep (past peak) |
| 31 | Henbit Deadnettle | Lamium amplexicaule | Mint Family | 2 | Apr (past peak) |
| 32 | Field Thistle | Cirsium discolor | Sunflowers, Daisies, Asters, and Allies | 2 | Aug (past peak) |
| 33 | Common Evening-Primrose | Oenothera biennis | evening primrose family | 2 | Oct (peak) |
| 34 | Indian tobacco | Lobelia inflata | bellflower family | 2 | Jul (past peak) |
| 35 | Butterfly bush | Buddleja davidii | figwort family | 2 | Sep (past peak) |
| 36 | Wild Carrot | Daucus carota | carrot family | 2 | Jul (past peak) |
| 37 | Flower-Of-An-Hour | Hibiscus trionum | Mallow and Hibiscus Family | 2 | Aug (past peak) |
| 38 | Obedient Plant | Physostegia virginiana | Mint Family | 2 | Sep (past peak) |
| 39 | Bird's-Foot Trefoil | Lotus corniculatus | Legumes | 1 | Jun (past peak) |
| 40 | Broadleaf Arrowhead | Sagittaria latifolia | Water-Plantain family | 1 | Sep (past peak) |
| 41 | Yellow Passionflower | Passiflora lutea | Passionfruit Family | 1 | Jul (past peak) |
| 42 | Purple Passionflower | Passiflora incarnata | Passionfruit Family | 1 | Aug (past peak) |
| 43 | Firewheel | Gaillardia pulchella | Sunflowers, Daisies, Asters, and Allies | 1 | May (past peak) |
| 44 | Red Clover | Trifolium pratense | Legumes | 1 | May (past peak) |
| 45 | Common Morning-Glory | Ipomoea purpurea | bindweed family | 1 | Sep (past peak) |
| 46 | Carolina horsenettle | Solanum carolinense | nightshade family | 1 | Jun (past peak) |
| 47 | Bull Thistle | Cirsium vulgare | Sunflowers, Daisies, Asters, and Allies | 1 | Aug (past peak) |
| 48 | Common Cat's-ear | Hypochaeris radicata | Sunflowers, Daisies, Asters, and Allies | 1 | May (past peak) |
| 49 | Ribwort Plantain | Plantago lanceolata | Plantain Family | 1 | May (past peak) |
| 50 | Oxeye Daisy | Leucanthemum vulgare | Sunflowers, Daisies, Asters, and Allies | 1 | Jun (past peak) |