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Cupressaceae family

Seaside Juniper Juniperus maritima

Native

Seaside Juniper is a tree native to Canada and the lower 48 states. It grows to 49 ft.

More about this plant

Juniperus maritima is a species of juniper known by the common name seaside juniper. It is native to the central Salish Sea region in southwestern British Columbia and northwestern Washington, where it is an endemic species and is abundant on coast bluffs as well as on dry mountain ridges on the Olympic Peninsula. It was previously included in the description of the Rocky Mountain juniper but was separated in 2007. Genetic analysis revealed that what appeared to be Rocky Mountain junipers in the Puget Sound were not of the same species as those elsewhere. The Puget Sound species also differs in morphology, with faster-maturing cones that have protruding seeds, and other differences. It is especially unique in habitat. The seaside juniper occurs at the edge of the water, next to the sound or the nearby lakes, in a milder, wetter climate on sandy, granite soils, even sand dunes in one location. J. scopulorum grows in drier, rockier substrates in colder locations higher in the mountains. It is also noted that seaside juniper reproduces itself and does not interbreed with other junipers, further evidence that it should be called a separate species. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 9 derived from its U.S. range
Size & form
Sources · Size & form
TRY Plant Trait Database (CC BY 4.0) — Height
Height
49 ft
In the garden
Canopy layer — Sits in the canopy of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts ~42 caterpillar species

Juniperus supports ~42 caterpillar species.

Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a strong genus.

Keystone count (genus-level) from Warren II 2026 (CC0) · Tallamy host-use records. Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (13) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[07] Description — Wikipedia (CC BY-SA)
[08] Ecological value — Warren II 2026 (CC0) · Tallamy host-use counts
[09] Conservation rank — NatureServe Explorer (CC BY)
[11] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[12] Caterpillar host count — Warren II 2026 (Dryad, CC0) · Tallamy host-use counts
[13] Caterpillar species — NHM HOSTS (CC0)
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