Scientific: Eustoma russellianum (formerly Eustoma grandiflorum, and before that it was known as Lisianthus grandiflorum)
Common: lisianthus, Texas bluebell, prairie gentian
Family:
Gentianaceae
Origin: Southern Great Plains of the United States

Pronounciation: Ewe-STO-ma rus-sel-li-AN-um

Hardiness zones
Sunset
All
USDA All

Landscape Use: Mixed spring, summer, and fall flower borders, accent, containers

Form & Character: Erect, stiff, formal, fragile, delicate.

Growth Habit: Moderate depending on hybrid selection from 4 inches to 2 feet tall, usually narrow with few lateral branches.

Foliage/Texture: Glaucous ovate to oblong simple leaves that are sessile and clasp about glaucous stems; medium texture.

Flowers & Fruits: Terminal large blossoms to as much as 3 inches across, single and double, many colors ranging from white to deep violet/purple with dark colored centers; fruit inconspicuous.

Seasonal Color: Blooms throughout the summer.

Temperature: Prefers warm weather, but is stressed during the highest heat of a Phoenix summer.

Light: Full sun to partial shade, avoid hot western exposures.

Soil: Well drained and organic, salt sensitive.  

Watering: Regular

Pruning: None is needed, remove spent flower heads to keep plant visually tidy.

Propagation: Set out as transplants in Phoenix in April and May for summer bedding plant color.  Otherwise propagated by seed after purchase of improved F1 hybrid selections such as the 'Echo' Series and the 'Heidi' series.

Disease and pests: Root rot in warm poorly drained soils, lisianthus necrosis virus.

Additional comments: Texas bluebell is one of three species of Eustoma.  It has received much attention by horticultural breeders to produce several improved F1 hydrids for landscape garden use as colorful bedding plants. The large flowers of the improved F1 hybrids can be as much as 3 inches wide.