
Flower profile
Sweet pepperbush
Clethra alnifolia
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.
*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.
🌱 Sample spot. Handmade gift picks from independent shops will appear here once our shop partnership is approved. These cards are placeholders, not real products.
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Sweet pepperbush art print
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Sweet pepperbush greeting card
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Sweet pepperbush mug
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Sweet pepperbush earrings
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Sweet pepperbush embroidery pattern
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Sweet pepperbush sticker
When does it bloom?
In New Hampshire, most flowering sightings come in July–August.
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?
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
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
- USDA, NRCS. PLANTS Database, profile CLAL3.
- iNaturalist, Clethra alnifolia: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
- Wikipedia, Clethra alnifolia (lead quoted under CC BY-SA 4.0).
- New Hampshire: New Hampshire Official Rare Plants List (Ncr 312, eff. Jan 1, 2020).
- New Hampshire: NH Prohibited Invasive Species List (Agr 3800, Table 3800.1).
- USFWS, ECOS species database (ESA listing check), October 17, 2026.
- NatureServe Explorer, Clethra alnifolia (global and state ranks).
- Edibility and toxicity: NC State Extension.
- Photo: Ken-ichi Ueda via iNaturalist · CC BY 4.0 · resized.


