How to Grow Lomandra Serenity

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Lomandra Serenity

Lomandra longifolia 'Serenity'

grass

Lomandra Serenity is an ornamental native Australian grass with fine, upright, silvery-green foliage that forms a compact, clumping mound. This evergreen perennial is valued for its year-round structural appeal, low maintenance requirements, and excellent drought tolerance once established. It produces delicate cream to yellow flowers in spring and early summer that attract pollinators.

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Example Lomandra Serenity timeline · Pittsburgh, PA (Zone 6b)

Plant Lomandra Serenity
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest Lomandra Serenity
Late summer into fall

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

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Sun: Full sun to part shade; 6+ hours daily sun produces best color and density

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Water: Drought tolerant once established; water moderately during establishment (first 6-12 months), then minimal watering except in extreme heat or extended drought

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Spacing: 24-36 inches

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Days to maturity: Not applicable; ornamental grass reaches mature size in 18-24 months

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Planting depth: Plant at soil level; do not bury crown

Soil

Type: Well-draining sandy or gravelly soil; tolerates poor, infertile soils

pH: 5.5-7.5

Amendments:

Coarse sand or gravel for drainage improvement Minimal organic matter needed

Growing Zones

Find your zone →

Thrives in zones 9-11; frost hardy to approximately 20°F (-6°C)

9a 9b 10a 10b 11a 11b

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Growth Stages

Establishment

6-12 months

Young plant with sparse, fine foliage developing from the crown; slow initial growth as root system develops

Water regularly but allow soil to dry between waterings; protect from extreme heat in first summer; avoid overwatering which causes root rot

Vegetative Growth

12-18 months

Foliage density increases; upright mound expands; silvery-green color intensifies

Minimal fertilizer needed; light pruning of dead foliage if desired; maintain good drainage

Flowering

4-8 weeks, typically spring to early summer

Cream to pale yellow flower spikes emerge above foliage; subtle, delicate inflorescences

Do not deadhead unless flowers are unwanted; allow flowers to remain for pollinator benefit; no special care needed

Mature/Established

2+ years indefinitely

Full-sized mound (18-24 inches tall and wide) with dense, fine foliage; excellent structural presence; fully drought tolerant

Minimal maintenance; no fertilizer typically required; remove any dead foliage or damaged stems; occasional light pruning maintains shape if desired

Companion Planting

Plan your garden →

Plant with:

Agapanthus Echinacea Lavender Russian Sage Sedums Catmint Coreopsis Salvia

Avoid planting near:

Plants requiring consistently moist soil Species preferring acidic soils below 5.5 Aggressive spreaders that compete for root space

Common Pests

and (Gastropoda)
Remove by hand; less problematic in well-draining soils; copper barriers or slug traps if severe
Increase humidity; spray foliage with water; apply neem oil or insecticidal soap if infestation occurs
Prune affected stems; spray with horticultural oil during dormant season or active growth

Uses

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Drought-Tolerant Landscaping

Household

Lomandra Serenity is ideal for water-wise gardens, xeriscaping, and sustainable landscape design, particularly in arid and Mediterranean climates. Once established, it requires minimal supplemental watering and no chemical fertilizers. [source]

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Ornamental Garden Structure

Household

The fine, upright silvery-green foliage provides year-round texture and visual interest in borders, mass plantings, or accent positions. Works well in contemporary and native plant gardens. [source]

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Pollinator Support

Wildlife

Spring and summer flowers attract native bees, butterflies, and other beneficial insects, contributing to garden biodiversity and ecosystem health. [source]

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Low-Maintenance Container Growing

Household

Lomandra Serenity adapts well to large containers and raised beds, making it suitable for patios, balconies, and situations where soil quality cannot be controlled. Ensure excellent drainage. [source]

Harvest Tips

Not applicable for ornamental grass. Foliage can be cut back in late winter/early spring before new growth; remove dead or brown foliage as needed year-round for aesthetic purposes.

Fun Facts

🌱 Lomandra longifolia is native to eastern Australia and has been used by Indigenous Australians for thousands of years; the genus name 'Lomandra' comes from the Greek words meaning 'edge' and 'man,' referring to the plant's structure.
🌱 The 'Serenity' cultivar was selected for its compact growth habit, silvery foliage color, and superior drought tolerance compared to the species, making it ideal for modern water-conscious gardens.
🌱 Lomandra Serenity is virtually pest and disease-free in most growing conditions and requires no pruning, fertilizing, or deadheading, making it one of the lowest-maintenance ornamental grasses available.

Gardening Terms

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

Crown Deadhead Full Sun Perennial

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