lisianthus Grandiflorum Doublini I Blue F1

lisianthus Grandiflorum Doublini I Blue F1 seeds

(Eustoma grandiflorum — Doublini Series Group 1 — Professional Cut Flower Variety)

Doublini is the mini-rose without thorns — fully double, petite rose–shaped flowers crowning the tops of the stems for an attractive and long-lasting effect in the vase. It produces masses of strong, small, truly double flowers with the hardness of Sakata’s Rosita series. The Doublini series represents a distinct approach to lisianthus breeding compared to standard large-flowered series such as Alissa or Echo. Rather than maximizing individual bloom size, Doublini optimizes bloom number and form — producing stems that carry a profusion of small, perfectly formed, tightly doubled blooms that cluster at the stem tips in a display that more closely resembles a spray rose than a traditional lisianthus.

The Blue color in the Doublini range is the variety that most directly connects to the wild origins of the species. The typical wild Eustoma grandiflorum plant has blue-purple flowers — it is the natural color of the prairie gentian native to the central and southern United States. Decades of Japanese breeding by Sakata and others have produced lisianthus in virtually every color except true red, but blue remains the color with the deepest connection to the species’ identity. In Doublini I Blue, this ancestral color is expressed in a rich, saturated blue-violet that intensifies under ultraviolet light — a property noted in Sakata’s own cultural documentation, where UV exposure is listed as a factor that deepens flower color intensity in lisianthus.

Doublini is a Group I cut flower variety with a stem height of 75–85 cm, pelleted seeds, and a top-flowering plant habit that provides good transportability. The top-flowering habit — where blooms cluster at the apex of the stem rather than being distributed along its length — is a specific characteristic of the Doublini series that distinguishes it from branching spray-type lisianthus and gives it a distinctive bouquet-ready appearance at harvest. Lisianthus flowering is triggered by three factors in order of importance: temperature (warmer temperatures accelerate flowering), light intensity (high light intensity accelerates flowering), and day length (long days accelerate flowering). Understanding these three triggers is the key to scheduling Doublini I Blue correctly for Kuwait’s cool-season production window.

Blue and blue-violet tones occupy a unique position in the cut flower trade. True blue is one of the rarest colors in the floral world — roses, peonies, and dahlias have all resisted the development of genuine blue pigmentation through conventional breeding. Lisianthus blue violet, derived from the anthocyanin pigments native to the wild species, is among the most convincing blue tones available in any commercial cut flower, and Doublini 1 Blue delivers this color in the novel miniature rose format that makes it immediately distinguishable and commercially distinctive.

Variety Details

• Botanical Name: Eustoma grandiflorum (syn. Lisianthus russellianus)
• Series: Doublini
• Variety: Doublini I Blue Flowering
• Group: Group I (Winter/Spring production: November–April)
• Breeder: Sakata Seed Corporation (Japan)
• Flower Style: Petite double rose-shaped — top-flowering habit
• Seed Type: F1 Hybrid, pelleted
• Plant Type: Annual (perennial in frost-free climates)
• Family: GentianaceaeCommon Names: Lisianthus, Prairie Gentian, Texas Bluebell

Key Features

• Sakata professional breeding — Doublini is the definitive miniature rose lisianthus series Petite fully double rose-shaped blooms — fundamentally different form from standard lisianthus
• Top-flowering plant habit — blooms cluster at stem apex for immediate bouquet-ready presentation
• Rich blue violet color — the ancestral color of wild Eustoma, among the truest blues in cut flowers
• Strong stems of 75–85 cm with excellent transportability — Rosita-level structural hardness
• Group I classification — Winter/Spring production window, ideal for Kuwait’s cool season
• Exceptional vase life — 14–21 days in clean water with flower food
• No thorns — all the visual impact of a rose spray stem with none of the handling difficulties
• Pelleted seeds for easier handling and more precise sowing
• Not fragrant — lisianthus is currently a non-fragrant cut flower species
• Requires patience — slow from seed to flower (approximately 5–6 months)

Plant Information

• Height: 75–85 cm
• Spread: 25–35 cm
• Plant Type: Annual
• Habit: Upright, top-flowering — blooms clustered at stem apex
• Flower Size: Small, petite — approximately 3–4 cm across per individual bloom
• Flower Form: Fully double, rose-shaped miniature
• Flower Color: Rich blue-violet
• Stem Structure: Strong, upright, good transportability

Germination Instructions

• Lisianthus requires careful attention to temperature throughout the entire growing process — this is the single most important factor between success and failure.
• Sow one pelleted seed per cell into a deep-cell seedling tray.
• Light is needed for germination, but a thin layer of fine vermiculite covering the seed will help to control algae growth.
• Keep growing media evenly moist but not saturated — adequate moisture is essential to dissolve the pellet coat around the seed.
• Do not allow the media to dry out at any point during germination.
• Covering the trays with clear plastic domes helps maintain consistent moisture and temperature.
• During the germination phase of 10–15 days, maintain temperatures at 20–22°C.
• After germination, grow seedlings on at 15–20°C with good ventilation — excess moisture causes damping off and mold.
• Seedlings are very slow to grow and can take up to 75 days to reach readiness for transplanting.
• Rosetting —where the plant fails to elongate and produces only a flat basal cluster of leaves — occurs when temperatures exceed 29°C during the day or 21°C at night for extended periods, or if seedlings dry out or are overwatered.
• Keeping night temperatures cool at 13–15°C can minimize rosetting even if daytime temperatures rise higher than desired.
• For Kuwait: sow in air-conditioned conditions in August.
• Maintain the seedling tray in a cool indoor space where night temperatures do not exceed 20°C.
• If rosetting occurs despite precautions, place the affected plants in the coolest available spot — ideally near an air conditioning vent at 10°C — for approximately 30 days to reverse the condition before transplanting.

Growing Tips

• Grow lisianthus in healthy soil rich in organic matter with an ideal pH of 6.5–7.0.
• Once the seedlings have 4 true leaves, they are ready to be transplanted — approximately 60–75 days from seeding.
• Do not let the plugs become root bound as this causes flowers to bloom earlier on short stems.
  Plant seedlings 10–20 cm apart, keeping the crown at or just above the soil line to prevent stem rot.
• Keep soil evenly moist but never saturated. Do not let the plants dry out.
• Water at the base of the plant only — overhead watering causes spotting on the petals, which is particularly visible on deeply colored blooms.
• In Kuwait’s outdoor beds, drip irrigation or careful hand watering at soil level is strongly preferred.
• Provide bamboo stakes or a simple horizontal net of string supported at 40 cm height to keep stems upright as plants grow.
• Once budding and flowering are initiated, rosetting is no longer a concern and the plants can handle more temperature fluctuation.
• Harvest when one or more flowers on the stem are open.
• Harvesting or pinching the first bloom encourages a more uniform set of subsequent blooms per stem.
• Harvesting is best done in the morning when temperatures are coolest.
• Place stems immediately into clean buckets of cool water.

Gulf Planting Season

• Indoor sowing (air-conditioned, pelleted seeds in cell trays): August
• Grow on indoors in air-conditioned conditions: August to October
• Transplant outdoors to final bed position: November
• Peak cut flower harvest: In spring
• Note: Lisianthus is one of the most temperature-sensitive crops available from seed — successful results in Kuwait depend entirely on completing the seedling phase indoors in air-conditioned conditions.
• Sow in August to allow the full 12–13-week indoor growing period before outdoor temperatures moderate in November.
• Night temperatures must not exceed 21°C during the seedling phase — exceeding this threshold triggers rosetting which is difficult to reverse.
• The Doublini 1 Blue Group 1 designation confirms its suitability for Kuwait’s cool season harvest window on spring, when temperatures, light levels, and day length align with the variety’s flowering triggers.
• Do not transplant outdoors until daytime temperatures are consistently below 32°C.

Garden & Floral Uses

• Doublini 1 Blue occupies a unique niche in the lisianthus cut flower range — it is the variety that most directly bridges the worlds of lisianthus and spray rose in a single stem.
• Where Alissa I Rose and Alissa I Pure White present large, individual showcase blooms, Doublini 1 Blue presents a cluster of small, perfectly formed miniature roses at the stem apex that delivers immediate visual impact in both single-variety and mixed arrangements.
• The rich blue violet color is one of the most commercially distinctive tones in any cut flower palette — it contrasts sharply with white, cream, blush, and peach tones, and harmonizes naturally with lilac, lavender, and silver-foliage companions.
• In Kuwait’s cool-season cutting garden, Doublini 1 Blue planted alongside Alissa I Pure White and Alissa I Rose creates a three-variety lisianthus collection that covers the full range from large showcase blooms to delicate miniature clusters, providing material for arrangements of radically different characters from the same growing beds.
• The blue-violet tone of Doublini pairs particularly well with white ranunculus, cream stock, and silver dusty miller — a combination that reads as sophisticated and bridal without being literal.
• The 14–21-day vase life and excellent transportability confirm its professional-grade credentials for anyone producing cut flowers for sale, gift, or home use throughout the Gulf cool season.