Hybrid

Rosanne Green

Eustoma grandiflorum

Photo: Conway, Agnes Ethel; Conway, Martin, Sir · Wikimedia Commons · (No restrictions)

Harvest

140-150d

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 Rosanne Green in USDA Zone 7

All Zone 7 flower →

Zone Map

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Rosanne Green · Zones 8–10

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-18 inches

SoilWell-draining, fertile loam with pH 6.0-6.5

WaterRegular and consistent; moderate moisture never allowing drying or waterlogging

SeasonWarm season annual

ColorGreen-gold

Size2-3"

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

Novel, 2-3" blooms with lovely green-gold color and slightly ruffled petals. Group 1, best suited for spring production. Lisianthus is also known as prairie gentian, Texas bluebell, and showy prairie gentian. Pelleted seeds. According to Johnny's Selected Seeds, Rosanne Green is 140 - 150 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

Rosanne Green reaches harvest at 140 - 150 days from sowing per Johnny's Selected Seeds. Expect 2-3" 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 Rosanne Green stems last 10-14 days in a clean vase with flower food and cool room conditions (65-70°F). Change water every 2-3 days and re-cut stem bases to improve water uptake. For drying, hang bundles upside-down (5-10 stems per bundle) in a warm, dark, dry space with good air circulation for 2-3 weeks until completely papery. Dried Rosanne Green retains color beautifully and lasts indefinitely in low-humidity storage. You can also freeze stems by placing them flat on a tray, freezing solid overnight, then storing in freezer bags for up to 3 months (useful for florists planning ahead). Silica gel drying preserves form and color with exceptional clarity over 1-2 weeks, ideal if you want museum-quality specimens.

History & Origin

Rosanne Green is an F1 hybrid developed through controlled cross-pollination. Listed in the Johnny's Selected Seeds catalog.

Origin: Nebraska south to Texas.

Advantages

+Unique green-gold color adds distinctive appeal to floral arrangements
+Compact 2-3 inch blooms suit small bouquets and tight spacing
+Easy difficulty level makes it accessible for beginner growers
+Pelleted seeds simplify sowing and improve germination consistency
+Optimized for spring production timing with reliable 140-150 day cycle

Considerations

-Long growing season requires significant greenhouse space investment
-Lisianthus susceptible to root rot in poorly drained soil
-Group 1 classification limits flexibility for year-round production scheduling

Companion Plants

Marigolds (especially Tagetes patula) are worth planting nearby — their root and foliar compounds deter aphids and whiteflies, two pests that hit lisianthus hard indoors and out. Sweet Alyssum pulls in predatory wasps and hoverflies that feed on those same insects without competing much at 12-18 inch spacing. Lavender and Catmint repel a range of soft-bodied pests and stay shallow-rooted enough that they don't fight lisianthus for water. Keep lisianthus clear of Fennel, which pushes allelopathic root exudates that stunt most neighbors, and Black Walnut, whose juglone toxicity moves through the soil and will shut a lisianthus down before you figure out what's wrong.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Lavender

Deters pests with aromatic oils and attracts pollinators like bees

Nasturtiums

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

Sweet Alyssum

Attracts beneficial insects like lacewings and parasitic wasps for pest control

Zinnia

Attracts butterflies and beneficial insects while providing complementary colors

Catmint

Repels ants, aphids, and rodents while attracting beneficial pollinators

Cosmos

Attracts beneficial insects and provides structural support without competing for nutrients

Chives

Repel aphids and other soft-bodied insects with their strong sulfur compounds

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive 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 (primarily when grown indoors or in warm climates)

Diseases

Powdery mildew, root rot, damping-off (seedlings)

Troubleshooting Rosanne Green

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

Seedlings collapsing at soil level, stems pinched and dark, within the first 2-3 weeks of germination

Likely Causes

Damping-off — a complex of soil-borne fungi (Pythium, Rhizoctonia) that thrive in cool, wet, poorly ventilated conditions
Overwatering or trays with no drainage

What to Do

1.Water from the bottom only, and let the surface dry slightly between waterings
2.Run a small fan near seedlings for 30-60 minutes a day to improve air circulation
3.Start fresh in sterile seed-starting mix — don't reuse last season's soil for lisianthus

White powdery patches on upper leaf surfaces, usually appearing after plants reach 6+ inches tall

Likely Causes

Powdery mildew (Erysiphe cichoracearum or related species) — peaks when nights drop below 60°F and days stay warm, especially with low airflow
Plants spaced too close together, blocking circulation

What to Do

1.Space plants at least 12 inches apart — closer than that and you're asking for it
2.Apply a dilute potassium bicarbonate spray (1 tablespoon per gallon of water) at first sign, weekly
3.Switch to morning drip or base watering; evening overhead watering keeps foliage wet overnight

Leaves yellowing from the bottom up, stunted growth, and roots that look brown and mushy when you pull a plant

Likely Causes

Root rot — most often Pythium or Phytophthora, both encouraged by waterlogged soil
Containers or beds without adequate drainage holding water against the crown

What to Do

1.Check that pots have drainage holes; if growing in-ground, work in perlite or coarse sand to open up the soil structure
2.Pull and discard any plant with mushy roots — it won't recover
3.Let the top inch of soil dry between waterings, even though lisianthus prefers consistent moisture overall

Sticky residue on leaves, distorted new growth, or small white insects lifting off the foliage when you brush it

Likely Causes

Whiteflies (Trialeurodes vaporariorum) — especially common in greenhouse or indoor starts
Aphids clustering on new growth, also producing honeydew that invites sooty mold
Spider mites in hot, dry conditions — look for fine webbing on leaf undersides

What to Do

1.Hang yellow sticky traps to catch adult whiteflies and track whether numbers are climbing
2.Knock aphids off with a firm stream of water, then follow up with insecticidal soap (2-3% solution) every 5-7 days
3.For spider mites, raise humidity around the plants and apply neem oil to leaf undersides in the early morning before temperatures climb

Frequently Asked Questions

How long does Rosanne Green lisianthus take to bloom from seed?▼

Rosanne Green requires 140-150 days from sowing to first bloom. Start seeds indoors 8-10 weeks before your target flower date, then transplant outside after frost danger passes. Total timeline from seed to harvest is typically 5 months. This extended season is normal for lisianthus and reflects the variety's Group 1 breeding for spring production. Plan accordingly—rushing the process or forcing warmer conditions won't accelerate bloom and often reduces plant vigor.

Is Rosanne Green lisianthus easy for beginners?▼

Rosanne Green is rated easy in terms of post-transplant care and pest/disease resistance, but the seed-starting phase is challenging for beginners. Germination is slow (10-14 days) and finicky, requiring consistent moisture, warm soil (70-75°F), and bright light. Seedlings grow slowly and are prone to damping-off if overwatered. Once transplants are established and in the garden, however, care is straightforward. First-time growers should consider purchasing transplants rather than starting seeds to avoid frustration.

Can you grow Rosanne Green lisianthus in containers?▼

Yes, Rosanne Green grows well in containers (6-8 inch minimum) with well-draining potting mix, provided you maintain consistent moisture and air circulation. Container plants may need staking for stability. Benefits include easier climate control (you can move pots indoors if frost threatens late in the season) and reduced disease pressure if air flow is good. Water container plants more frequently than in-ground plants, as pots dry quickly, especially in warm weather.

Why are my Rosanne Green lisianthus seedlings dying?▼

The most common cause is overwatering or inconsistent moisture at the seedling stage—lisianthus seeds need moist (not wet) soil and are prone to damping-off fungal disease. Second, seedlings demand bright light (16+ hours daily); insufficient light causes weak, elongated growth. Third, soil temperature below 70°F dramatically slows germination and increases disease risk. Use a heat mat, ensure bright grow lights, and water only when the top of the soil just begins to dry. Improve air circulation with a small fan.

What makes Rosanne Green's green-gold color unique compared to other lisianthus?▼

Most traditional lisianthus varieties are white, pink, purple, or lavender—true green coloration is rare. Rosanne Green's green-gold hue is a recent breeding achievement, created through selective hybridization to expand the color palette for florists and specialty growers. This unique color doesn't occur naturally in wild lisianthus species and remains uncommon in retail seed catalogs, making Rosanne Green a distinctive choice for arrangers seeking novel options.

How do you harvest Rosanne Green lisianthus for longest vase life?▼

Cut stems in early morning after dew dries, when the first or second floret is fully open and the green-gold color is fully developed. Use sharp shears and cut at a 45-degree angle above a leaf node. Place immediately in cool water with flower food. Remove lower foliage to prevent bacterial growth. Each stem will produce multiple side branches, extending your harvest. Change water every 2-3 days for vase life of 10-14 days. For dried flowers, wait until stems are fully open, then hang upside-down in a dark, dry space for 2-3 weeks.