What Are Those? 

Achillea millefolium (yarrow)

Host plant to: American Ladies, Fritillaries + Checkerspots

Allium

Host plant to: Bees + Butterflies

Althaea officinalis (marshmallow)

Host plant to: Bees

Amelanchier arborea (downy serviceberry)

Host plant to: Red-spotted Purple, Red-spotted Purple, 100 species of caterpillars, Cedar Waxwings, American Robins, Baltimore Orioles, Ruffed Grouse, Thrushes, Towhees, Mourning Doves, Eastern Bluebirds, Northern Flicker, Cardinals, Hermit Thrush, Hairy Woodpeckers

Aquilegia (columbine)

Host plant to: Columbine Duskywing, Hummingbirds + Bees

Asclepias tuberosa (butterfly milkweed)

Host plant to: Monarch Butterfly, Queen Butterfly, Bees + Hummingbirds

Asclepias verticillata (whorled milkweed)

Host plant to: Monarch Butterfly, Queen Butterfly, Soldier Butterfly, Hummingbirds

Ceanothus americanus (New Jersey tea)

Host plant to: Mottled Duskywing, Spring Azure, + Summer Azure butterflies

Cephalanthus occidentalis (buttonbush)

Host plant to: Titan Sphinx moth,  Hydrangea Sphinx moth, skippers, hummingbirds + bees

Clethra alnifolia (summersweet)

Host plant to: Sweet Pepperbush Nola Moth, Large Lace Border, Unicorn catepillar, butterflies, bees + hummingbirds

Conoclinium coelestinum (blue mistflower)

Host plant to: Lined Ruby Tiger Moth + Clymene Moth

Cornus sericea (red osier dogwood)

Host plant to: spring azure butterfly, various moths + bees

Cosmos bipinnatus (cosmos)

Host plant to: lacewings, hoverflies, tachninid flies + various bees

Dianthus barbatus (sweet william)

Not technically a host plant, but birds enjoy the seeds, and pollinators enjoy various parts of the plant

Echinacea purpurea (purple coneflower)

Host plant to: Silvery Checkerspot Butterfly + various butterfly/moth species

Erigeron philadelphicus (fleabane)

Host plant to: Lynx flower moth, northern metalmark, speyer's cucullia, wavy-lined emerald + various bees/flies/butterflies

Eryngium yuccifolium (rattlesnake master)

Host plant to: black swallowtail butterfly, monarchs + songbirds

Hydrangea paniculata (hydrangea little lime punch)

Not a host plant, more for ornamental purposes 

Hydrangea macrophylla (endless summer hydrangea)

Not a host plant, more for ornamental purposes 

Liatris spicata (dense blazing star)

Host plant to: Glorious Flower Moth, Three-lined Flower Moth, and Blazing Star Borer Moth, bees, birds + various insects

Monarda fistulosa (wild bergamot)

Host plant to: Raspberry pyrausta butterfly, various bees + butterflies

Muhlenbergia capillaris (pink muhly grass)

Host plant to: various moths + butterflies

Nepeta (catmint)

Host plant to: Hermit sphinx moth, False crocus geometer moth + various other winged creatures

Orange lilies

Not a host plant, but attractive to pollinators like bees + butterflies

Pachysandra terminalis

Not a host plant, and grows very aggressively. Used for groundcover in shaded areas where plants struggle to grow

Peony

Not a host plant, more for ornamental purposes

Phlox paniculata (garden phlox)

Host plant to: various butterfly + moth larvae

Pink profusion salvia

Not a host, but bumblebees + butterflies love to feed on their blooms

Pycnanthemum tenuifolium (narrow leaved mountain mint)

Host plant to: Gray Hairstreak Butterfly

Rhododendron

Host plant to:

Columbia silkmoth + bees

Rudbeckia hirta (black eyed susan)

Host plant to:

Silvery Checkerspot, Gorgone Checkerspot, Bordered Patch, Wavy-lined Emerald moth + goldfinches 

Sambucus nigra ssp. canadensis (elderberry)

Host plant to:

 Polyphemus moth, Cecropia moth, and at least 27 other moth and butterfly species

Solidago rugosa (wrinkleleaf goldenrod)

Host plant to: various insects, several moth and butterfly caterpillars, leaf beetles, and leafhoppers, eastern goldfinch, indigo bunting and swamp sparrow

Sunflowers

Host plant to:

Painted Lady, Silvery Checkerspot, Bordered Patch, bees, beetles, hummingbirds, various birds + flies

Symphyotrichum novae-angliae (new england aster)

Host plant to:

Taxus (yew)

Host plant to: Thrushes, waxwings + various moths

Thymus serpyllum (creeping thyme)

Host plant to: Common blue butterfly, Large blue butterfly + bees

Vaccinium corymbosum (highbush blueberry)

Host plant to:

Brown Elfin butterfly, Striped Hairstreak butterfly, Spring Azure butterfly, Henry's Elfin butterfly, Red-spotted Purple butterfly, Frosted Elfin butterfly, Polyphemus moth, Beggar moth, Huckleberry sphinx moth, bumble bees, small, solitary bees, carpenter bees +honey bees

Viola soraria (violet)

Host plant to:

Great Spangled Fritillary, Coronis Fritillary, Mormon Fritillary, Variegated Fritillary,  Edwards' Fritillary,  Aphrodite Fritillary, Meadow Fritillary,  Silver-bordered Fritillary, various bees + birds