Eustoma

Eustoma is a small genus of flowering plants in the Gentianaceae family, commonly known as lisianthus or prairie gentian. Native to warm regions of the Americas, the group includes several species, with Eustoma grandiflorum being the best known in cultivation. In horticulture, the species has often been listed as Eustoma russellianum, and taxonomy has varied over time.

The flowers resemble roses or peonies, with multiple overlapping petals forming a cup- or funnel-shaped bloom. Plants are herbaceous and can be perennial in warm climates, but are typically grown as annuals in temperate regions. Blossoms occur on tall, slender stems and come in a wide color palette, including white, pink, purple, lavender, and bi-color varieties. The flowering period can be extended with careful deadheading and warm growing conditions.

Cultivation and uses: Eustoma grandiflorum is widely grown for cut flowers and garden ornamentals. Commercial production often begins from seeds sown indoors, requiring warmth and good light. They prefer well-drained soil, full sun, and regular moisture, and are sensitive to frost and extreme heat. Staking is commonly used to support tall stems. In garden settings they are valued for long vase life and versatility in arrangements, as well as for bedding displays in suitable climates.

Taxonomy notes: The genus is placed in Gentianaceae, but species-level classification has varied, contributing to multiple synonyms in horticultural literature. Despite taxonomic changes, lisianthus remains a popular choice among growers and florists.