Cold hardiness

Future

2050

2100

These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.

Now

Zone 6b

USDA

Published baseline for this location from 1991-2020.

Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer

Won't grow here

2050

Zone 7a

Plotwright

Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).

Marginal

In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.

✕→⚠

Out of range today, but marginally possible by 2050.

Heat tolerance

Future

2050

2100

Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.

Loading AHS heat-zone data for this location...

Where this plant fits

Suitable across 39 ecoregions — 35 climate-resilient through 2070 · 1 suited today · 3 newly possible by 2070. Best matches first.

Appalachian mixed mesophytic forests

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Appalachian-Blue Ridge forests

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Arizona Mountains forests

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Atlantic coastal pine barrens

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Blue Mountains forests

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Canadian Aspen forests and parklands

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Central Pacific Northwest coastal forests

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Central Tallgrass prairie

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Central-Southern Cascades Forests

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Chilean Matorral

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What it needs

Conditions

Light

Full sun / Part shade

Water

Consistent moisture

Spacing

360"

Habit

Dense, rounded aromatic broadleaf evergreen tree (multi-stemmed and shrubby on harsh sites)

Care tips

•

Site it away from oaks and tanoaks in regions with Sudden Oak Death — California bay is a key foliar reservoir of Phytophthora ramorum and can pass the pathogen to those trees; this is the single most important placement rule.

•

Give it real room: it matures to a broad, dense 30-75 foot tree as wide as it is tall, so it is a shade or structure tree, not a small-garden or foundation plant.

•

Water deeply through the first several summers to establish the slow-growing roots; once settled it is markedly drought-tolerant and well suited to dry-summer, Mediterranean-climate gardens.

Lifecycle

Planting

Plant in fall or early spring in full sun to part shade in deep, well-drained soil with consistent moisture while establishing; it adapts to a range of soils and, once settled, tolerates considerable summer drought in its Mediterranean-climate home. Choose the site carefully: it is a long-lived 30-75 foot tree, and in regions affected by Sudden Oak Death it must NOT be planted near oaks or tanoaks, since its foliage is a key reservoir of the pathogen.

Transplanting

Move while young, from a container or balled-and-burlapped, keeping the rootball intact; large established trees resent root disturbance and are slow to recover. Water generously until well established and avoid disturbing the roots of an older specimen.

Early growth

Slow to establish — water deeply through the first several summers while the root system develops; once settled it is notably drought-tolerant. Mulch to keep roots cool and moist, and be patient, as early growth is unhurried even though the tree is very long-lived.

Maturity

A long-lived, slow-growing tree maturing to roughly 30-75 feet (smaller and shrubbier on exposed or dry sites) with a broad, dense, rounded crown. Routine pruning is rarely needed; give it open room since the canopy spreads as wide as it is tall. Its chief health concern is its role as a foliar host of Phytophthora ramorum (Sudden Oak Death), which causes leaf lesions on the bay itself and lets it infect nearby oaks.

Propagation

Propagated from the fresh seed (the single nut inside each fruit), which germinates best when sown promptly after cleaning; it can also be grown from cuttings, though they root slowly. Seedlings and young plants establish gradually and reward patience.

Pollination

Self-fertile

California bay carries small clusters of pale yellow-green flowers in late winter and early spring that are pollinated by small flies and bees drawn to the early bloom; it is generally self-fertile, so a single tree can set the round, olive-like fruit. It is an insect-pollinated broadleaf tree rather than a wind-pollinated conifer, and its very early flowering makes it a useful early-season nectar source in mild-winter regions.

Plants don't grow alone

Foliage forage

Mammal

White-tailed deer (Odocoileus virginianus)

Deer may browse the foliage of young plants, though the strongly aromatic, oil-rich leaves make California bay far less preferred than many other trees; browse pressure is generally light and the strong scent often deters it.

Shelter / habitat

Bird

Eastern songbirds (multi-species) (multiple species (Passeriformes))

The dense, year-round evergreen canopy offers nesting and roosting cover for songbirds, as large broadleaf evergreens generally do; this is a plausible generic shelter association rather than a documented tie for any specific bird, since the species is a West Coast native outside the typical Eastern range of these generic songbirds.

For people

Parts edible

The aromatic leaves are used like Mediterranean bay (Laurus nobilis) to flavor cooking, but they are MUCH stronger — use sparingly, a fraction of what a recipe calls for, and remove before serving. The single nut inside each fruit is edible when roasted and was a traditional food of Indigenous Californians. Use both with care: the pungent volatile oils are strong enough that crushing or inhaling them can trigger headaches in sensitive people, which is why the tree is nicknamed the 'headache tree.'

Climate notes

•

NC State Extension lists Umbellularia californica for USDA hardiness zones 7a-9b; it is native to coastal California and southwestern Oregon, a Pacific-coast endemic of the western United States rather than an Eastern or introduced species.

•

A Mediterranean-climate native adapted to wet winters and dry summers: established trees are notably drought-tolerant and take coastal conditions and lean soils, though they grow largest with deeper soil and consistent moisture.

•

Heat is generally tolerated within its zone 7-9 range, but it favors the milder, more maritime end of that band over the most extreme interior heat; winter cold sets its limit at the cool zone-7 edge.

•

Its most important caution is disease ecology, not pests on the tree itself: California bay is a key foliar host and reservoir of Phytophthora ramorum (Sudden Oak Death) and can spread it to nearby oaks and tanoaks, so siting away from those trees matters in affected regions.

In the designer

Growth over time

360-900" tall · 360-900" spread

Mature specimen of roughly 30-75 feet with a broad, dense, rounded crown; long-lived and slow-growing, it wants real room and can become a major shade tree where the site allows.

Design roles: Structure · Focal point · Edible

Seasonal interest

Spring

Summer

Fall

Winter

Filled = the plant has seasonal interest · ▾ now = your current season

California bay laurel

At a glance

Why it matters

Cold hardiness

Heat tolerance

Where this plant fits

What it needs

Lifecycle

Pollination

Plants don't grow alone

For people

Climate notes

In the designer

Seasonal interest

Sources & citations