Bloomipedia
Sweet pepperbush (Clethra alnifolia)
Photo: Ken-ichi Ueda via iNaturalist · CC BY 4.0 · resized

Flower profile

Sweet pepperbush

Clethra alnifolia

Native to New Hampshire

Sweet pepperbush is a flowering plant that USDA PLANTS lists as native in the lower 48 states. In New Hampshire it's most often seen in bloom in July–August.

20states
537NH sightings*
21,830U.S. sightings*

*iNaturalist research-grade observations, as of October 17, 2026.

On our lists for: New Hampshire

Quick look

Clethra alnifolia, the coastal sweetpepperbush or summer sweet, is a species of flowering plant in the genus Clethra of the family Clethraceae, native to eastern North America from southern Nova Scotia and Maine south to northern Florida, and west to eastern Texas. It is a deciduous shrub which grows in wetlands, bogs and woodland streams.

  • It belongs to the Clethraceae family. iNaturalist
  • USDA PLANTS describes it as a shrub with a perennial life cycle. USDA PLANTS
  • USDA PLANTS lists it as native in the lower 48 states and records it in 20 states. USDA PLANTS
  • NatureServe lists it as native to New Hampshire. NatureServe
  • In New Hampshire, most iNaturalist sightings of it in flower come in July–August. iNaturalist
  • USDA PLANTS lists its flower color as white. USDA PLANTS
  • USDA PLANTS gives its bloom period as summer. USDA PLANTS
  • USDA PLANTS lists a mature height of about 16 ft. USDA PLANTS
  • iNaturalist has 537 research-grade sightings of it in New Hampshire, ranking #71 among the 109 flowers on our New Hampshire list. iNaturalist

Sweet pepperbush gift ideas

Handmade sweet pepperbush gifts from independent makers.

When does it bloom?

In New Hampshire, most flowering sightings come in July–August.

Flowering records by month in New Hampshire (iNaturalist research-grade observations marked “Flowering”) (50 records)

Conservation status

Federal (U.S. ESA)
Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. USFWS ECOS
NatureServe global
G5 Secure worldwide. NatureServe
New Hampshire
Not listed Not on New Hampshire Official Rare Plants List (Ncr 312, eff. Jan 1, 2020). NatureServe: SNR, not yet ranked in New Hampshire. NH Ncr 312
Rare elsewhere
Other states where NatureServe ranks it rare or missing: ME (S2), TN (S1). (S1 critically imperiled, S2 imperiled, SH possibly extirpated, SX presumed extirpated.)

Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.

Can you eat it?

For peopleNot well documented

None of the sources we checked (NC State Extension (no edibility or poison notes on its page), USDA PLANTS) say whether it's edible or poisonous for people. NC State Extension

For petsNot well documented

It isn't on the ASPCA plant list, and NC State Extension doesn't flag it for pets.

🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.

Where does it grow?

USDA PLANTS records sweet pepperbush in 20 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Alabama, Connecticut, Delaware, Florida, Georgia, Louisiana, Maine, Maryland, Massachusetts, Mississippi, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, Virginia.

New Hampshire counties with USDA records: Cheshire, Hillsborough, Merrimack, Rockingham, Strafford.

More New Hampshire flowers

Sources