Eustoma grandiflorum Rosanne Black Pearl F1 | Group 1 Lisianthus

Eustoma grandiflorum Rosanne Black Pearl F1 stands out with exceptionally dark purple flowers in a rich aubergine shade. Its full, double blooms and gently ruffled petals bring depth and drama to bouquets, wedding flowers and contemporary floral arrangements.

Part of the Rosanne F1 series, Black Pearl combines distinctive colour with strong stems, firm petals and excellent vase life. This Group 1 lisianthus is best suited to spring production.

Plant Information

Botanical Name: Eustoma grandiflorum
Common Name: Lisianthus, prairie gentian, Texas bluebell
Series: Rosanne
Variety: Black Pearl F1
Flowering Group: 1
Cultivation: Grown as an annual cut flower
Flower Colour: Very dark purple with rich aubergine tones
Flower Type: Double, with gently ruffled petals
Height: Approximately 80–90 cm, depending on growing conditions
Days to Maturity: Approximately 140–150 days under suitable conditions
Preferred Production Season: Spring
Seed Form: Pelleted
Hybrid Status: F1 hybrid
Growing Position: Bright and sheltered; suitable for greenhouse production
Soil: Fertile and well-drained
Uses: Cut flowers, wedding bouquets and floral arrangements

Deep Aubergine Flowers for Striking Bouquets

Rosanne Black Pearl F1 is a beautiful choice for growers seeking dark purple lisianthus. Its deep colour adds a striking focal point while the softly ruffled petals give the flowers an elegant finish.

Pair it with white, cream or blush pink for contrast. Apricot flowers and fresh green foliage highlight its warm aubergine tones, while lavender and mauve create a harmonious purple palette.

Although named Black Pearl, its flowers are very dark purple rather than true black. Their appearance varies with lighting and growing conditions.

The Rosanne F1 Series

The Rosanne series is known for unusual colours, full double flowers and strong stems. Firm petals help reduce the risk of damage during handling and transport, while excellent vase life makes the series particularly useful for cut flower production.

Rosanne includes varieties in Groups 1, 2 and 3. Black Pearl F1 belongs to Group 1, making it especially suitable for spring production.

Sowing & Seedling Care

Lisianthus develops slowly during its early stages, so begin propagation well ahead of the intended flowering season.

Sow the pelleted seeds on the surface of a fine, well-drained seed-starting substrate. Do not bury them. Carefully moisten the pellets so their coating can dissolve, and keep the substrate evenly moist without waterlogging.

Provide good light during propagation and after germination. Early indoor sowings benefit from supplementary grow lights.

Transplant seedlings before their roots become crowded. Handle the root ball gently and maintain the original planting depth.

Growing Conditions & Care

Grow in fertile, well-drained soil in a bright, sheltered position. Greenhouse cultivation helps manage temperature, moisture and airflow.

Keep soil moisture consistent, avoiding prolonged wet conditions. Water at the base of the plants and provide good ventilation to help keep foliage and flowers dry.

Use a support net to encourage straight stems and support the plants as the flowers develop.

Flowering Time

The supplied maturity estimate is approximately 140–150 days. Actual flowering time depends on temperature, light levels, seedling development and growing conditions.

Allow sufficient time for the slow early growth of lisianthus when planning sowing and spring flowering.

Harvesting & Vase Care

Cut stems when several flowers have opened. Remove leaves below the waterline and place the stems promptly in clean water.

Refresh the water regularly and use cut flower food if available. Careful harvesting and handling help preserve the excellent vase life of the Rosanne series.