How to Grow Westringia (Coastal Rosemary)
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Westringia (Coastal Rosemary)
Westringia fruticosa
shrubWestringia is a hardy, evergreen Australian native shrub prized for its silvery-green foliage and delicate white, pink, or purple flowers. It's a drought-tolerant plant that thrives in coastal conditions and is widely used in Mediterranean and native gardens for its low-maintenance nature and year-round appeal.
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Example Westringia (Coastal Rosemary) timeline · Pittsburgh, PA (Zone 6b)
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Plant Westringia (Coastal Rosemary)
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Westringia (Coastal Rosemary)
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 9-11; tolerates coastal salt spray and sandy soils
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Establishment
4-6 weeksYoung plant with minimal foliage; root system developing
Water moderately 2-3 times weekly for first 4-6 weeks; mulch lightly around base (not touching stem); protect from wind
Vegetative Growth
3-6 monthsPlant fills out with silver-green needle-like leaves; branching increases
Reduce watering as plant matures; prune lightly to encourage bushiness; feed monthly with low-phosphorus native plant fertilizer
Pre-flowering
2-4 weeksFoliage fully developed; flower buds begin to form along stems
Maintain consistent dry-side watering; reduce nitrogen fertilizer; allow plant shape to develop naturally
Flowering
3-4 months (spring to early summer, often recurring in fall)Delicate white, pink, or purple flowers appear along stems; attracts bees and butterflies
Minimal water needed; deadhead spent flowers to encourage continuous blooms; avoid heavy pruning during flowering
Dormancy/Rest
2-3 months (late summer to early fall)Flowering slows; plant enters maintenance mode with evergreen foliage retained
Water sparingly; no fertilizer; prune back if needed to rejuvenate; prepare for next season
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with horticultural oil in early morning or late afternoon; prune affected branches; encourage natural predators
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Spray with insecticidal soap; increase air circulation; remove heavily infested leaves
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Improve drainage immediately; reduce watering frequency; remove affected plant if widespread; avoid mulch contact with stem
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Improve air circulation; reduce overhead watering; spray with sulfur dust if severe; prune lower branches
Uses
Coastal landscaping and hedge plant
HouseholdWestringia is ideal for coastal gardens due to its salt-spray tolerance and ability to thrive in poor, sandy soils. It serves as an excellent informal hedge, screen, or specimen plant requiring minimal maintenance once established. [source]
Pollinator and bird attraction
WildlifeThe delicate flowers attract native bees, butterflies, and honeyeaters, supporting local pollinator populations. The dense foliage provides shelter for small birds and beneficial insects. [source]
Cut flowers and floral arrangements
CraftWestringia branches with flowers are popular in fresh and dried floral arrangements, lasting 1-2 weeks in water. The silvery foliage adds texture and color contrast to bouquets. [source]
Culinary herb potential
CulinarySome Westringia species have edible leaves with a rosemary-like flavor suitable for tea, though this is less common than ornamental use. Always verify species before culinary application. [source]
Drought-tolerant native garden design
HouseholdAs an Australian native requiring minimal water and fertilizer once established, Westringia is central to sustainable, water-wise garden design and xeriscape principles. [source]
Harvest Tips
This is an ornamental shrub, not harvested for fruit or seeds. Prune stems for fresh floral arrangements at any time during growing season; best stems have abundant flowers
Fun Facts
- 🌱 Westringia is native to coastal regions of New South Wales and Queensland in Australia, where it evolved to tolerate salt spray, poor soils, and extended droughts—making it exceptionally low-maintenance in difficult garden conditions.
- 🌱 The name 'Coastal Rosemary' comes from its superficial resemblance to Mediterranean rosemary, though they are unrelated; Westringia is actually in the Lamiaceae family and is not a true rosemary.
- 🌱 Westringia flowers bloom in cycles throughout the year, with peak flowering in spring and often a secondary flush in fall, providing extended color and pollinator support compared to single-season bloomers.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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