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How to Grow Liriope Big Blue

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Liriope Big Blue

Liriope muscari 'Big Blue'

grass

Liriope 'Big Blue' is a clumping ornamental grass known for its striking deep purple-blue flower spikes that rise above dark green, strappy foliage. This evergreen perennial is a vigorous, low-maintenance groundcover that adds texture and color to landscape borders, mass plantings, and edging. It thrives in hot, dry conditions and offers excellent year-round interest with its attractive seed heads in fall.

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Example Liriope Big Blue timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Liriope Big Blue

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Liriope Big Blue

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Liriope Big Blue dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade; 4-8 hours of sun daily for best flowering
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Water: Drought-tolerant once established; water regularly during first growing season to establish deep roots; minimal watering needed after establishment except during severe drought
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Spacing: 12-18 inches
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Days to maturity: Flowering typically begins in second season; full maturity in 2-3 years
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Planting depth: Shallow; plant crown at soil surface, not deeper

Soil

Type: Well-draining loamy to sandy soil; tolerates poor soil
pH: 5.5-7.5
Amendments:
Compost Sand for drainage Mulch

Growing Zones

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Thrives in zones 5b-10b; best performance in zones 6-9

5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b

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Growth Stages

1

Establishment

4-6 weeks

New transplants develop root system and establish clump structure with fresh green foliage

Water consistently during first 4-6 weeks; apply mulch around base; avoid planting too deep as crown rot can occur

2

Vegetative Growth

Spring to early summer (8-10 weeks)

Clump expands with dense mounding growth of dark green, strap-like leaves reaching 12-18 inches tall

Minimal fertilizer needed; remove dead foliage in early spring before new growth emerges

3

Flowering

6-8 weeks (July-September)

Tall, distinctive deep purple-blue flower spikes emerge from the foliage canopy, rising 6-12 inches above leaf mound

Deadheading is optional; many gardeners leave flowers for seed head interest; spikes appear mid to late summer

4

Seed Formation & Dormancy

Fall through winter (8-12 weeks)

Flower spikes develop persistent dark berries and seed heads; foliage gradually becomes bronze-tinged in cool weather

Leave seed heads on plant for winter interest and wildlife food; no major care required; foliage remains evergreen

5

Spring Cleanup

2-3 weeks in late February to early April

Dried foliage from previous year may brown or show frost damage; new growth emerges at base and crown

Cut back dead foliage to 3-4 inches above ground in late winter/early spring before new growth; apply slow-release fertilizer if desired

Companion Planting

Plan your garden →

Plant with:

Russian Sage Black-eyed Susan Coreopsis Daylily Salvia Sedums Ornamental onions Catmint Lantana Coneflower

Avoid planting near:

Invasive grasses that spread aggressively Plants requiring frequent watering (in dry landscapes) Deep-rooted trees competing for water

Common Pests

  • Spray with water to dislodge; use insecticidal soap in severe cases; ensure adequate humidity

  • and

    Handpick; use slug bait or copper barriers; reduce mulch directly around crown

  • Remove affected foliage; ensure good air circulation; avoid overhead watering; apply fungicide if severe

  • Spray with strong water stream; use insecticidal soap; parasitic wasps are natural predators

Uses

🦋

Pollinator & Bird Food

Wildlife

The deep purple-blue flowers attract bees, butterflies, and other pollinators throughout summer. The dark seed berries are an excellent food source for songbirds in fall and winter. [source]

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Landscape & Ornamental Design

Household

Excellent as a groundcover, border edging, mass planting, or specimen accent in xeric gardens. The contrasting dark foliage and purple flowers add texture and color year-round, with persistent seed heads extending visual interest into winter. [source]

🎨

Cut Flowers & Dried Arrangements

Craft

Purple-blue spikes and dried seed heads are attractive in fresh and dried floral arrangements. Flowers cut in mid-summer provide striking color; seed heads dry naturally on the plant and can be harvested for long-lasting displays. [source]

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Low-Maintenance Xeriscaping

Household

Once established, requires minimal water, fertilizer, and pest management, making it ideal for drought-tolerant and water-wise gardens. Perfect for low-input landscape designs and areas with poor, depleted soil. [source]

Harvest Tips

This is an ornamental plant, not grown for harvest. However, you can collect seed heads in fall by cutting spikes after they dry; cut flowers for arrangements during summer bloom period when purple-blue spikes are at peak color

Fun Facts

  • 🌱 Liriope 'Big Blue' is sometimes called 'Lilyturf' because its flower spikes resemble miniature lilies, though it's not related to true lilies.
  • 🌱 The plant is native to East Asia (China, Japan, and Vietnam) and was selectively bred for the larger, more vibrant purple-blue flowers that distinguish the 'Big Blue' cultivar.
  • 🌱 Liriope foliage remains evergreen in most zones, meaning it provides color and structure throughout winter when many other plants have died back, making it especially valuable in cool-climate gardens.

Gardening Terms

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

Crown Deadhead Full Sun Mulch Partial Shade Perennial Transplant
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