Hybrid

Rosanne 2 Clear Green

Eustoma grandiflorum

Wikimedia Commons via Eustoma russellianum

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 2 Clear Green in USDA Zone 7

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Zone Map

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Rosanne 2 Clear Green · Zones 8–10

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-18 inches

SoilWell-draining, slightly fertile loam or potting mix

WaterRegular; consistent moisture, avoid waterlogging

SeasonWarm season annual

ColorPistachio green

Size2-2 1/2"

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
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	—
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	—

Complete Growing Guide

Pistachio-green blooms are 2-2 1/2" wide, deeply layered and lightly ruffled. Flowers are a truer green than Rosanne Green, which is closer to a green-gold hue. Group 2, for early spring to summer harvest. Lisianthus is also known as prairie gentian, Texas bluebell, and showy prairie gentian. Pelleted seeds. According to Johnny's Selected Seeds, Rosanne 2 Clear 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 2 Clear Green reaches harvest at 140 - 150 days from sowing per Johnny's Selected Seeds. Expect 2-2 1/2" 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

Keep cut Rosanne 2 Clear Green flowers in a clean vase with cool water (60–65°F) and commercial flower food. Change water every 2–3 days and re-cut stems at a 45-degree angle. Vase life typically reaches 7–10 days when kept cool and away from ripening fruit (ethylene-sensitive). Store cut flowers in the refrigerator at 35–40°F if you need to hold them before arranging—they'll keep for 3–5 additional days in cold storage.

For preservation, air-dry flowers by hanging them upside down in a dark, warm, well-ventilated space (ideal for dried arrangements lasting months). Glycerin treatment produces softer, flexible dried flowers: stand stems in a 1:3 glycerin-to-water solution for 2–3 weeks. Silica gel drying preserves color most vividly but requires careful handling. Frozen lisianthus (shock-frozen for commercial use) is rarely practical for home gardeners, as thawed flowers lose structural integrity.

History & Origin

Rosanne 2 Clear Green is an F1 hybrid developed through controlled cross-pollination. Listed in the Johnny's Selected Seeds catalog.

Origin: Nebraska south to Texas.

Advantages

+True pistachio-green blooms offer distinctive color unavailable in other varieties
+Deeply layered, ruffled flowers create premium visual appeal for arrangements
+140-150 day timeline allows early spring through summer harvest windows
+Easy cultivation difficulty makes it accessible to beginning and experienced growers
+Pelleted seeds improve handling and spacing accuracy during planting

Considerations

-Lisianthus requires consistent moisture and humidity to prevent bud drop
-Group 2 classification limits flexibility for growers needing year-round production
-Green coloring may appeal to niche markets rather than mainstream florists

Companion Plants

Marigolds and sweet alyssum are the most practical companions for lisianthus. French marigolds (Tagetes patula) produce root secretions that suppress soil nematodes, and both crops draw in parasitic wasps and hoverflies that keep aphid and thrips populations in check — exactly the insects that target lisianthus buds before they open. Zinnias and cosmos fill a similar role without competing hard for moisture; since they're cut-flower crops themselves, you're not burning bed space on something that doesn't pull its weight. Lavender is worth slipping in nearby — whiteflies seem to avoid it, and lisianthus shares its preference for good drainage and full sun.

Black walnut is the one plant to site well away from. Juglone moves through the soil from walnut roots and fallen leaf debris, and lisianthus — already slow to establish over its 140–150 day run — doesn't recover from that kind of chemical stress. Sunflowers are allelopathic too, releasing germination-inhibiting compounds, and a 3–4 foot sunflower stalk will shade a 1–3 foot lisianthus into the ground before it ever blooms.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Sweet Alyssum

Attracts beneficial insects like lacewings and provides ground cover

Nasturtiums

Act as trap crops for aphids and cucumber beetles while deterring squash bugs

Petunias

Repel aphids, tomato hornworms, and squash bugs with natural chemicals

Lavender

Deters moths, fleas, and mosquitoes while attracting pollinators

Zinnia

Attracts beneficial predatory insects and provides complementary colors

Cosmos

Attracts beneficial insects and provides vertical interest without competition

Catnip

Repels ants, aphids, and cabbage loopers more effectively than DEET

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

Sunflowers

Compete aggressively for nutrients and water, may inhibit smaller plants

Pests & Disease Resistance

Common Pests

Aphids, thrips, whiteflies

Diseases

Powdery mildew, root rot, gray mold (Botrytis)

Troubleshooting Rosanne 2 Clear Green

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

Soft, water-soaked stem at or just below the soil line, plant wilting even when soil is moist

Likely Causes

Root rot (Pythium or Phytophthora spp.) — triggered by waterlogged soil or pots without adequate drainage
Overwatering combined with heavy, compacted growing mix

What to Do

1.Pull the plant and inspect roots — black or brown mushy roots confirm rot; there's no saving a badly rotted stem
2.Going forward, amend beds with perlite or coarse grit and never let lisianthus sit in standing water
3.Water deeply but infrequently; let the top inch of soil dry slightly between waterings

White powdery coating on upper leaf surfaces, usually appearing mid-season when nights cool down

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — favored by warm days and cool, humid nights with poor airflow
Crowded spacing under 12 inches that traps moisture around foliage

What to Do

1.Thin plants to at least 12 inches apart and remove any overlapping foliage at the base
2.Apply a potassium bicarbonate-based spray (follow label rates) at the first sign of white patches — it won't reverse existing damage but stops spread
3.Water at the base, not overhead, and do it in the morning so foliage dries before nightfall

Tiny silvery streaks or stippling on petals and new leaves, flowers distorted or failing to open fully

Likely Causes

Western flower thrips (Frankliniella occidentalis) — especially bad during dry stretches
Aphid colonies on tender growing tips, which also leave sticky honeydew that draws sooty mold

What to Do

1.Check buds and the undersides of young leaves with a hand lens — thrips run about 1–2 mm and are visible if you look closely
2.Knock aphids off with a firm spray of water early in the morning; repeat every 3–4 days for two weeks
3.For persistent thrips pressure, apply spinosad-based insecticide per label directions; avoid spraying open blooms to protect pollinators

Frequently Asked Questions

How long does Rosanne 2 Clear Green take to grow from seed to flower?▼

Rosanne 2 Clear Green reaches harvest-ready blooms in 140–150 days from sowing. Factor in 8–10 weeks for indoor seed starting before transplanting, plus 6–8 additional weeks in the garden before flowering begins. In most U.S. zones, seeds started indoors in late January produce flowers by mid-summer.

Is Rosanne 2 Clear Green good for beginner gardeners?▼

Yes—it's classified as an easy-to-grow hybrid. However, beginners should understand that lisianthus requires consistent moisture, warm soil, and good air circulation. The seed-starting phase demands attention to humidity and temperature, but once established in the garden, Rosanne 2 is low-maintenance. Start seeds indoors to ensure success.

Can you grow Rosanne 2 Clear Green in containers?▼

Absolutely. Rosanne 2 performs well in 5–7 gallon containers or larger with quality potting mix. Space one plant per container or space multiple plants 12–18 inches apart in window boxes. Container growing offers easier moisture and temperature control, plus portability. Use well-draining potting soil and fertilize every 2–3 weeks for continuous flowering.

What's the difference between Rosanne 2 Clear Green and Rosanne Green?▼

The primary difference is color: Rosanne 2 Clear Green produces a true pistachio-green tone, while the original Rosanne Green leans toward a warmer green-gold hue. Both are Group 2 hybrids with similar 140–150-day maturity. Choose based on your desired aesthetic—Clear Green is preferred for modern, minimalist floral arrangements.

How often should I water Rosanne 2 Clear Green?▼

Water deeply and consistently to keep soil evenly moist, especially during active growth and flowering. In hot weather, this may mean daily watering. Avoid waterlogging; ensure your soil or potting mix drains freely. Inconsistent watering triggers bud drop. Mulch soil-grown plants to regulate moisture and temperature.

When should I plant Rosanne 2 Clear Green seeds?▼

Start seeds indoors 8–10 weeks before your last spring frost date. For summer flowering, sow in late January–February in most U.S. zones. Transplant seedlings outdoors after frost danger passes and soil temperature reaches 60°F+. Group 2 classification makes it ideal for spring/summer harvest cycles; avoid late summer sowings in short-season regions.