How to Grow Coast Rosemary

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Coast Rosemary

Westringia fruticosa

shrub

Coast rosemary is a compact, bushy evergreen shrub native to coastal Australia, prized for its needle-like foliage and delicate flowers. Despite its common name, it is not a true rosemary (Rosmarinus officinalis) but shares similar ornamental qualities. It thrives in coastal and Mediterranean climates with minimal maintenance once established.

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Example Coast Rosemary timeline · Pittsburgh, PA (Zone 6b)

Plant Coast Rosemary
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Coast Rosemary
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Coast Rosemary dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily; tolerates partial shade

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Water: Drought tolerant once established; moderate watering during growing season. Reduce watering in winter. Water at soil level to avoid fungal issues. Does not tolerate waterlogged conditions.

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Spacing: 24 inches

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Days to maturity:

🌱

Planting depth: Transplant at same depth as nursery container; surface sow seeds with light

Soil

Type: Well-draining sandy or loamy soil

pH: 6.0-7.0

Amendments:

Coarse sand Perlite Gravel for improved drainage

Growing Zones

Find your zone →

Thrives in zones 9b-11, tolerates coastal salt spray and strong winds

9b 10a 10b 11a 11b

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Growth Stages

Seedling

3-4 weeks

Tiny seedlings with fine, needle-like cotyledons and first true leaves emerging

Keep soil lightly moist but not waterlogged. Provide bright light and ensure excellent drainage. Protect from strong winds.

Juvenile

2-3 months

Young plant establishing root system with increasing foliage density, reaching 6-12 inches tall

Gradually increase watering as plant grows. Begin light pruning to encourage branching. Reduce fertilizer; avoid high nitrogen.

Vegetative

6+ months

Maturing shrub with dense, bushy growth and established root system, 12-24+ inches tall

Water moderately during dry spells. Prune in spring to shape and maintain compact form. Fertilize sparingly; prefers lean soils.

Flowering

4-6 months (typically spring-early summer, may extend with suitable climate)

Plant produces delicate, tubular flowers in white, pink, or lavender colors along branch tips

Maintain consistent watering during bloom. Avoid heavy pruning during flowering. Deadhead spent flowers to encourage continued blooming.

Mature

Perennial; many years

Fully established shrub, typically 2-3 feet tall and wide, with abundant flowers and dense foliage

Minimal intervention required. Light pruning maintains shape. Very drought tolerant. No regular fertilizing needed.

Companion Planting

Plan your garden →

Plant with:

Lavender Santolina Lamb's ear Catmint Grevillea Desert rose Ornamental grasses

Avoid planting near:

Water-loving plants Plants requiring rich, constantly moist soil Black walnut (juglone sensitivity)

Common Pests

Spray with water to dislodge; use horticultural oil or neem oil if severe. Improve air circulation.
Remove with rubbing alcohol on cotton swab; spray with neem oil or insecticidal soap. Reduce overwatering.
Prune out heavily infested branches. Spray horticultural oil during dormant season or use neem oil.
Ensure excellent drainage; do not overwater. Remove affected plant if severely compromised. Replant in fresh, well-draining soil.

Uses

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Ornamental landscaping

Household

Coast rosemary is an excellent choice for coastal gardens, xeriscaping, and drought-tolerant landscapes. Its tolerance of salt spray, wind, and poor soils makes it ideal for challenging garden conditions. [source]

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Cut flowers and floral arrangements

Craft

The delicate, long-lasting flowers and attractive foliage make attractive additions to fresh or dried floral arrangements. Cut stems last several weeks in water. [source]

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Pollinator and wildlife habitat

Wildlife

The flowers attract bees, butterflies, and hummingbirds, providing valuable nectar and pollen sources. Dense foliage offers shelter for birds and beneficial insects. [source]

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Windbreak and hedge

Household

Coast rosemary's dense, fine-textured growth habit and wind tolerance make it suitable for coastal hedging and windbreak applications. Can be pruned into formal or informal shapes. [source]

Harvest Tips

Coast rosemary is primarily grown as an ornamental shrub; foliage is not typically harvested for culinary use. Remove spent flowers regularly to encourage continued blooming. Harvest cuttings for propagation in spring or early summer from new growth.

Fun Facts

🌱 Despite its common name 'Coast rosemary,' Westringia fruticosa is not a true rosemary and belongs to a different genus native to Australia, making it a classic case of common name confusion in gardening.
🌱 Coast rosemary is extremely salt tolerant and thrives in coastal environments where many other plants struggle, earning it the nickname 'the plant for impossible places.'
🌱 The plant's needle-like leaves are aromatic when brushed, though unlike true rosemary (Rosmarinus officinalis), they are not culinary-grade and should not be consumed.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Partial Shade True Leaves

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