How to Grow Lisianthus 'Excalibur'

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Lisianthus 'Excalibur'

Eustoma grandiflorum 'Excalibur'

flower

Lisianthus 'Excalibur' is a premium cut flower variety prized for its large, ruffled double blooms in white, pink, or purple. Known for its elegant, rose-like appearance and long vase life, it's a popular choice for florists and high-end floral arrangements. This cultivar is particularly valued for its uniform growth and impressive flower production.

Looking for a specific variety?

Excalibur White Excalibur Pink Excalibur Purple Excalibur Bicolor Heidi Flare White

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Example Lisianthus 'Excalibur' timeline · Pittsburgh, PA (Zone 6b)

Plant Lisianthus 'Excalibur'
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
First Lisianthus 'Excalibur' blooms
Around Aug 15

≈ 120 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Lisianthus 'Excalibur' dates for your own zip code.

Growing Conditions

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Sun: Full sun, 12-14 hours daily for optimal flowering; benefits from afternoon shade in extremely hot climates

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Water: Keep soil consistently moist but not waterlogged; water at soil level to avoid foliar diseases. Lisianthus is sensitive to both drought and excessive moisture. Reduce watering slightly once flowering begins.

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Spacing: 6-8 inches

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Days to maturity: 120-180 days from seed to first bloom; typically 90-120 days from transplant

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Planting depth: Seeds should be surface-sown or barely covered (1/16 inch); transplants planted at same depth as container

Soil

Type: Well-draining, fertile loamy soil with excellent drainage

pH: 6.0-6.8

Amendments:

Peat moss or coconut coir for moisture retention Perlite or sand for drainage Balanced slow-release fertilizer Organic compost

Growing Zones

Find your zone →

Thrives in zones 10-11; grown as an annual or cool-season crop in most regions

10a 10b 11a 11b

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Growth Stages

Seed Germination

10-15 days

Tiny seeds germinate slowly under moist conditions. Very fine, thread-like seedlings emerge.

Maintain 70-75°F soil temperature. Use bottom heat. Keep soil moist with misting. Germination takes 10-15 days. Use sterile seed-starting mix and avoid fungal issues by ensuring good air circulation.

Seedling & Early Growth

4-6 weeks

Slow-growing seedlings develop their first true leaves. Growth is noticeably deliberate and requires patience.

Provide bright, indirect light (no harsh direct sun initially). Maintain 65-70°F daytime, 60-65°F nighttime. Keep consistently moist. Feed with diluted balanced fertilizer every 2 weeks. Handle gently—seedlings are delicate.

Vegetative Growth

8-12 weeks

Plant develops a strong root system and bushy foliage with multiple stems. Leaves are glossy, lance-shaped, and dark green.

Transition to full sun gradually. Harden off before planting outdoors. Provide support stakes as plants grow tall (24-30+ inches). Maintain warm temperatures (65-75°F). Begin regular fertilizing with balanced or slightly higher phosphorus formula. Pinch central shoot at 6-8 inches to encourage branching.

Budding & Flowering

4-8 weeks, then continuous flowering

Terminal buds form and develop into large, multi-petaled blooms. Flowers are double, ruffled, elegant, resembling miniature roses or peonies.

Provide consistent moisture and excellent drainage. Support tall stems with stakes or netting. Apply balanced or slightly phosphorus-rich fertilizer every 2 weeks. Remove any diseased foliage. Ensure 12+ hours of light daily. Maintain cool nights (55-65°F) to prolong bloom duration.

Peak Bloom & Harvest

4-12 weeks or longer depending on growing conditions

Flowers fully open with impressive, double-petaled blooms. Plant may produce multiple flowers per stem in succession.

Harvest stems when flowers are 3/4 open for longest vase life. Cut early morning with sharp, clean tools. Remove lower foliage from cut stems. Change vase water every 2-3 days. Continue deadheading faded flowers to encourage more blooms.

Companion Planting

Plan your garden →

Plant with:

Celosia Statice (Limonium) Hypericum berries Salvia Solidago (goldenrod) Ruscus Eucalyptus

Avoid planting near:

Heavy feeders that compete for nutrients Plants requiring frequent, vigorous watering that promote fungal diseases Tomatoes and peppers (different water/humidity needs)

Common Pests

Improve air circulation, reduce humidity, remove infected foliage immediately. Avoid overhead watering. Apply fungicide if severe. Space plants adequately.
Ensure excellent drainage and avoid overwatering. Use sterile soil. Drench soil with fungicide if detected early. Remove and dispose of severely affected plants.
Inspect undersides of leaves regularly. Use yellow sticky traps. Spray with insecticidal soap or neem oil. Introduce parasitic wasps in greenhouse settings.
Mist foliage regularly to increase humidity. Spray with water or horticultural oil. Use miticide if infestation is severe. Improve air circulation.
Spray with insecticidal soap, neem oil, or strong water spray. Use yellow sticky traps. Encourage natural predators like ladybugs.
Use blue or yellow sticky traps. Spray with insecticidal soap or spinosad. Remove infected flowers. Maintain good sanitation.

Uses

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Edible Flowers

Culinary

Lisianthus flowers are non-toxic and can be used as elegant cake decorations or salad garnishes for fine dining presentations. Ensure flowers are pesticide-free if intended for consumption. [source]

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Premium Cut Flowers

Household

Lisianthus 'Excalibur' is a top choice for high-end florists, wedding arrangements, and luxury bouquets due to its rose-like double blooms and exceptional vase life of 7-14 days. It commands premium prices in the floral industry. [source]

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Dried Flowers & Arrangements

Craft

Flowers can be dried using silica gel, hang-dried, or pressed for long-lasting floral crafts, wedding mementos, and decorative arrangements. The ruffled double petals retain their shape well when dried. [source]

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Ornamental Garden Specimen

Household

The 'Excalibur' variety makes a stunning focal point in flower gardens, containers, and cutting gardens with its elegant, sophisticated appearance and continuous blooming. [source]

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Pollinator Attraction

Wildlife

Double blooms attract bees, butterflies, and other pollinators, supporting garden biodiversity and ecosystem health. [source]

Harvest Tips

Cut stems in early morning when flowers are 3/4 open for maximum vase life (7-14 days). Use sharp, clean scissors or pruners to avoid crushing stems. Remove lower foliage below the waterline to prevent bacterial growth. Change vase water every 2-3 days and recut stems at an angle. Lisianthus is prized for cut flowers and reaches peak quality when properly harvested and conditioned.

Fun Facts

🌱 Lisianthus is native to the warm regions of South America and Mexico, and the genus name Eustoma means 'beautiful mouth,' referring to the flower's elegant throat markings.
🌱 The 'Excalibur' cultivar is renowned in the florist industry for its exceptional uniformity and can produce flowers up to 3-4 inches in diameter with 20-30+ petals in a perfect double form.
🌱 Lisianthus seeds are extremely tiny (over 1 million seeds per ounce) and were historically difficult to germinate, but modern cultivars like 'Excalibur' have much better germination rates due to breeding advances.

Gardening Terms

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

Cultivar Deadhead Full Sun Germination pH True Leaves

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