Hybrid

Corelli Sugoi™ III White

Eustoma grandiflorum

Wikimedia Commons via Eustoma russellianum

Harvest

155-165d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

8–10

USDA hardiness

🗺️

Height

1-3 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Start Indoors

Transplant

Direct Sow

Showing dates for Corelli Sugoi™ III White in USDA Zone 7

All Zone 7 flower →

Zone Map

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Corelli Sugoi™ III White · Zones 8–10

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-15 inches

SoilWell-draining, rich in organic matter, slightly acidic (pH 6.0-7.0)

WaterRegular, consistent moisture—evenly moist soil without waterlogging

SeasonWarm season annual

ColorPure white

Size2 1/2-4"

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	April – May	June – July	June – August	—
Zone 4	March – April	June – June	June – July	—
Zone 5	March – April	May – June	May – July	—
Zone 6	March – April	May – June	May – July	—
Zone 7	February – March	April – May	April – June	—
Zone 8	February – March	April – May	April – June	—
Zone 9	January – February	March – April	March – May	—
Zone 10	January – January	February – March	February – April	—
Zone 1	May – June	July – August	July – September	—
Zone 2	April – May	June – July	June – August	—
Zone 11	January – January	January – February	January – March	—
Zone 12	January – January	January – February	January – March	—
Zone 13	January – January	January – February	January – March	—

Complete Growing Guide

2 1/2-4" wide fully double blooms are lush with abundant layering and ruffling. Flower color is pure white with a green center. The Corelli Sugoi series offers the large full blooms typical of the Corelli series, with a more heavily ruffled petal. Group 3 for late spring, summer, and fall harvest. Lisianthus is also known as prairie gentian, Texas bluebell, and showy prairie gentian. Pelleted seeds. According to Johnny's Selected Seeds, Corelli Sugoi™ III White is 155 - 165 days to maturity, annual, hybrid (f1). Notable features: Greenhouse Performer, Use for Cut Flowers and Bouquets.

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Loam (Silt), Sand. Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 0 ft. 9 in. - 1 ft. 0 in.. Maintenance: High. Propagation: Seed.

Harvesting

Corelli Sugoi™ III White reaches harvest at 155 - 165 days from sowing per Johnny's Selected Seeds. Expect 2 1/2-4" at peak. As an annual, harvest continues until frost ends the season.

This is an ornamental variety — not grown for harvest. Enjoy in the garden landscape.

Storage & Preservation

Fresh cut Corelli Sugoi™ III White flowers last 10–14 days in a clean vase with cool water and floral preservative changed every 2–3 days. Keep arrangement in a cool location (65–70°F) away from direct sun, ripening fruit, and sources of ethylene gas. Remove any foliage below the waterline and re-cut stems every few days at a 45-degree angle.

For preservation, air-drying is ideal for this variety due to its full, sturdy petals. Strip lower foliage, tie stems loosely in small bundles, and hang upside-down in a dark, warm, well-ventilated space (65–75°F) for 2–3 weeks until papery-dry. Store dried blooms in a cool, dark place in acid-free tissue to prevent moisture absorption. Alternatively, press individual florets between parchment paper under weights for 2–4 weeks to create botanical art or crafts. Silica gel drying also preserves color well: layer blooms in a container with silica crystals and seal for 5–7 days.

History & Origin

Corelli Sugoi™ III White is an F1 hybrid developed through controlled cross-pollination. Listed in the Johnny's Selected Seeds catalog.

Origin: Nebraska south to Texas.

Advantages

+Produces stunning 2.5-4 inch fully double white blooms with exceptional ruffling
+Pure white color with attractive green center adds sophisticated garden appeal
+Group 3 timing enables late spring through fall continuous harvest cycles
+Pelleted seeds simplify sowing and improve germination success rates
+Easy difficulty rating makes it accessible for beginner flower growers

Considerations

-Requires 155-165 days to maturity, demanding extended growing season commitment
-Lisianthus notoriously dislikes wet feet and needs precise moisture management
-Double blooms make flowers heavier and prone to rain damage or lodging

Companion Plants

Marigolds (French varieties like 'Petite Gold') are the most practical companion here — they deter aphids and whiteflies through scent, and since Corelli Sugoi III White is already vulnerable to both during indoor propagation and early outdoor stages, a border of marigolds planted 6–8 inches out gives you a reasonable first line of defense before the Lisianthus even hits the ground. Sweet Alyssum works differently: it attracts parasitic wasps and hoverflies that prey on aphids. At 3–4 inches tall, it won't shade anything, and the white-on-white combination looks deliberate rather than accidental.

Lavender and Catmint are worth placing nearby if you have them. Their volatile oils interfere with the host-finding signals that thrips and aphids use — it's not a dramatic knockdown, more like static on the frequency. In a mixed cutting garden they earn that real estate. Zinnia and Cosmos fill in quickly enough to act as a visual buffer while Lisianthus, which takes 155–165 days to bloom, catches up to them.

Black Walnut is the one to keep well away from — except the reason is worth spelling out. The tree exudes juglone, a compound toxic to many ornamentals, through root secretions and decomposing leaf litter. NC State Extension notes that the affected zone can extend 50–60 feet from the trunk, and sensitive plants can decline without any obvious above-ground cause. Fennel is a smaller concern in a flower bed than in a vegetable garden, but it produces allelopathic compounds that suppress nearby seedlings, so keep it in its own container or at least 3 feet out.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Sweet Alyssum

Attracts beneficial insects like hoverflies and provides ground cover

Nasturtiums

Act as trap crops for aphids and cucumber beetles, protecting nearby flowers

Lavender

Repels moths, fleas, and mosquitoes while attracting pollinators

Catmint

Deters ants, aphids, and rodents while providing long-season blooms

Zinnia

Attracts beneficial predatory insects and butterflies for pollination

Cosmos

Attracts beneficial insects and provides habitat for natural pest predators

Chives

Repel aphids and other soft-bodied insects with their strong scent

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive flowering plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby plants

Fennel

Inhibits growth of most garden plants through allelopathic root secretions

Pests & Disease Resistance

Common Pests

Whiteflies, spider mites, aphids in indoor propagation; thrips in flowering stage

Diseases

Damping-off (seedling stage), root rot from overwatering, powdery mildew in humid conditions

Troubleshooting Corelli Sugoi™ III White

What you'll see, why it happens, and what to do about it.

Seedlings collapsing at the soil line within the first 2–3 weeks after germination

Likely Causes

Damping-off caused by Pythium or Rhizoctonia fungi — both thrive in wet, poorly ventilated flats
Overwatering during the germination stage, which keeps the soil surface perpetually damp

What to Do

1.Water from the bottom by setting trays in a shallow dish — keep the surface drier
2.Run a small fan nearby on low to improve air circulation around seedlings
3.If damping-off appears, pull affected seedlings immediately and drench remaining cells with a dilute hydrogen peroxide solution (1 part 3% H2O2 to 9 parts water)

Leaves and stems covered in a white powdery coating, usually appearing after plants are 8–10 weeks old

Likely Causes

Powdery mildew (Erysiphe or Golovinomyces species) — common when humidity is high but airflow is restricted
Overcrowding plants at less than 12 inches apart, which traps moisture between foliage

What to Do

1.Thin or space plants to at least 12–15 inches so air can move through
2.Apply a baking soda spray (1 tablespoon per gallon of water with a few drops of dish soap) at first sign; reapply every 7 days
3.Avoid overhead watering — switch to drip or base watering to keep foliage dry

Tiny silver streaks or stippling on flower petals and upper leaves during the budding or flowering stage

Likely Causes

Western flower thrips (Frankliniella occidentalis) — they feed on soft petal tissue and are nearly invisible to the naked eye
Dry, hot conditions that accelerate thrips reproduction cycles

What to Do

1.Hang blue or yellow sticky traps near plants to monitor and reduce adult populations
2.Spray with spinosad (follow label rates) every 5–7 days for 2–3 cycles — thrips sheltering inside buds are hard to reach, so starting at first bud break matters more than waiting for visible damage
3.Remove and bag any heavily damaged blooms to cut down the local population

Yellowing leaves starting at the lower stems, with roots appearing brown or mushy when you pull a plant

Likely Causes

Root rot from Phytophthora or Pythium — almost always triggered by waterlogged soil or pots without adequate drainage
Heavy clay soil that holds water too long between waterings

What to Do

1.Pull affected plants — there's no saving a plant with fully rotted roots
2.Let the bed or container dry out before replanting; amend clay soil with perlite or coarse grit to improve drainage
3.For containers, make sure every pot has drainage holes and never leave them sitting in standing water for more than an hour

Frequently Asked Questions

How long does Corelli Sugoi™ III White take to grow from seed to flower?▼

Expect 155–165 days from transplanting seedlings outdoors to first blooms, plus 10–12 weeks of indoor seed starting beforehand. Plan your planting date 4.5–5.5 months before your desired harvest. Starting seeds indoors in January typically yields flowers by late May or early June in most climates.

Can you grow Corelli Sugoi™ III White in containers?▼

Yes, lisianthus thrives in containers. Use a minimum 5–7 gallon pot per plant with premium, well-draining potting soil. Provide full sun (6+ hours daily), consistent moisture without waterlogging, and biweekly feeding. Container-grown plants may be slightly shorter but produce excellent flowers. More frequent watering is necessary in hot weather.

Is Corelli Sugoi™ III White good for beginners?▼

It's moderate for beginners. The seed-starting phase is challenging (slow germination, damping-off risk), but once established outdoors, the plant is fairly forgiving if you maintain consistent watering and don't overwater. Focus on proper hardening-off and soil drainage, and you'll succeed.

What's the difference between Corelli Sugoi™ III and other lisianthus varieties?▼

The Corelli Sugoi™ III line features dramatically ruffled, fully double petals with exceptional layering—more ornate than standard Corelli varieties or single-flowered types. Blooms are larger (2.5–4") and longer-lasting (10–14 days). The green center is a distinctive trademark. It's bred specifically for premium cut-flower markets.

When should I plant Corelli Sugoi™ III White seeds indoors?▼

Sow seeds indoors 10–12 weeks before your last spring frost. In USDA zones 5–7, start seeds in mid-January for May/June outdoor transplanting. In warmer zones (8–10), delay to late January or early February. Count backward from your desired first-flower date (155–165 days after transplanting outdoors).

Do Corelli Sugoi™ III White flowers need special care as cut flowers?▼

Use flower preservative in vase water and change water every 2–3 days. Keep blooms cool (65–70°F), away from direct sun and ethylene sources. Remove foliage below the waterline. Re-cut stems at 45 degrees every few days. Delicate ruffled petals bruise easily, so handle gently. Blooms last 10–14 days with proper care.