Wildflower List & Bloom Times For Herbert Hoover National Historic Site

Bright purple petals wreath a spike-shaped flower head.
Purple prairie clover

NPS Photo by Erin Anfinson

A colorful pallette of flowers mixes with the green, purple, and golden hues of native grasses from April until late October. Golden alexanders, Canada anemones, spiderworts, yellow and purple coneflowers, and butterfly milkweeds blossom in spring and early summer. New England asters and numerous species of goldenrods attract monarch butterflies in late summer and early fall.

Bloom Times

Table of common species by approximate bloom times

Common Name
Family, Species

Blooms

Lousewort
Scrophulariaceae Pedicularis canadensis

Mid April through May

White avens
Rosaceae Geum canadense

May

Blue-eyed grass
Iridaceae Sisyrinchium campestre L.

May

Smooth dock
Polygonaceae Rumex altissimus

May

Foxglove penstemon
Scrophulariaceae Penstemon digitalis

May through late July

Cleavers
Rubiaceae Galium aparine

May through late July

Goat’s rue
Fabaceae Tephrosia virginiana

May through July

Prairie ragwort
Asteraceae Senecio plattensis

Mid May through mid June

Large-flowered beardtongue
Scrophulariaceae Penstemon grandiflorus

Late May through late June

Ohio spiderwort
Commelinaceae Tradescantia ohiensis

Late May through late June

Spiderwort
Commelinaceae Tradescantia bracteata

Late May through late June

Canada anemone
Ranunculaceae Anemone canadensis

Late May through early July

Windflower
Ranunculaceae Anemone cylindrica

Late May through early July

Purple meadow-rue
Ranunculaceae Thalictrum dasycarpum

Late May through late July

Wild four-o'clock
Nyctaginaceae Mirabilis nyctaginea

June and July

Fringed loosestrife
Primulaceae Lysimachia ciliata

June and July

Pale purple coneflower
Asteraceae Echinacea pallida

June and July

Spiked lobelia
Campanulaceae Lobelia spicata

June through mid August

Ground cherry
Solanaceae Physalis heterophylla

June through September

Norwegian cinquefoil
Rosaceae Potentilla norvegica

June through September

White vervain
Verbenaceae Verbena urticifolia

June through September

Butterfly milkweed
Apocynaceae Asclepias tuberosa

Early June through late July

White wild indigo
Fabaceae Baptisia lactea

Early June through late July

Black-eyed Susan
Asteraceae Rudbeckia hirta

Early June through late July

Ox-eye
Asteraceae Heliopsis helianthoides

Early June through July

Yellow coneflower
Asteraceae Ratibida pinnata

Early June through early August

Lead plant
Fabaceae Amorpha canescens

Mid June through mid July

Wild quinine
Asteraceae Parthenium integrifolium

Mid June through mid July

Spotted St. John's wort
Hypericaceae Hypericum punctatum

July

Blue vervain
Verbenaceae Verbena hastata

July through September

Brown-eyed Susan
Asteraceae Rudbeckia triloba

July through September

Obedient plant
Lamiaceae Physostegia parviflora

July through September

Tall cinquefoil
Rosaceae Potentilla arguta

July through early August

Purple prairie clover
Fabaceae Dalea purpurea

Early July through early August

White prairie clover
Fabaceae Dalea candida

Early July through early August

Compass plant
Asteraceae Silphium laciniatum

Early July through early August

Wild bergamot
Lamiaceae Monarda fistulosa

Early July through early August

Culver's root
Scrophulariaceae Veronicastrum virginicum

July through August

Royal catchfly
Caryophyllaceae Silene regia

July through August

Giant St. John's wort
Hypericaceae Hypericum pyramidatum

July through August

Flowering spurge
Euphorbiaceae Euphorbia corollata

July through August

Cup plant
Asteraceae Silphium perfoliatum

July through September

Prairie dock
Asteraceae Silphium terebinthinaceum

July through September

Tall coneflower
Asteraceae Rudbeckia laciniata

July through September

Wild lettuce
Asteraceae Lactuca canadensis

July through September

Partridge pea
Fabaceae Cassia fasciculata

July through September

Common mountain mint
Lamiaceae Pycnanthemum virginianum

July through September

Cardinal flower
Campanulaceae Lobelia cardinalis

July through September

Milk vetch
Fabaceae Astragalus canadensis

Mid July through mid August

Illinois tick-trefoil
Fabaceae Desmodium illinoense

Mid July through mid August

Showy tick-trefoil
Fabaceae Desmodium canadense

Mid July through mid August

Missouri goldenrod
Asteraceae Solidago missouriensis

Mid July through late August

Evening primrose
Onagraceae Oenothera biennis

Mid July through early September

Prairie blazing star
Asteraceae Liatris pycnostachya

August through early September

Rosinweed
Asteraceae Silphium integrifolium

August through early September

Ironweed
Asteraceae Vernonia fasciculata

Early August through mid September

Great lobelia
Campanulaceae Lobelia siphilitica

August through September

Showy goldenrod
Asteraceae Solidago speciosa

August through September

Smooth goldenrod
Asteraceae Solidago gigantea

August through September

Tall goldenrod
Asteraceae Solidago canadensis

August through September

Field goldenrod
Asteraceae Solidago nemoralis

Mid August through early September

Round-headed bush clover
Fabaceae Lespedeza capitata

Mid August through early September

Rough blazing star
Asteraceae Liatris aspera

Mid August through mid September

Stiff goldenrod
Asteraceae Solidago rigida

Mid August through mid September