Plant Profile: Eustoma grandiflorum

Eustoma grandiflorum, commonly known as Lisianthus, is a biennial flowering plant that can endure winter temperatures in USDA Zones 8-10. However, it is generally cultivated as an annual rather than a perennial. This plant thrives in average, moist, well-drained soil, preferring full sun in the morning and some shade in the afternoon. Due to the tiny size of its seeds and the lengthy maturation period from seed to plant, Lisianthus is often bought as a young plant or started indoors 10 to 12 weeks prior to the last frost. The flowers, which bloom from summer until the first frost, appear on either single or branching stems. To promote a bushier growth habit, you can pinch back the stems. The blooms are striking, available in pink, white, and lavender, and they also serve well as cut flowers. Additionally, this plant is recognized for its good drought resistance.

Typically, Lisianthus cultivars reach heights of 18 to 30 inches, although some dwarf varieties only grow to about 6 to 8 inches, making them suitable for pots or indoor settings. These cultivars come in a variety of flower colors, including shades of pink, blue-violet, and white, with some featuring double blooms. Lisianthus is highly regarded as a cut flower.

Regarding potential issues, Lisianthus does not face significant threats from insects or diseases. However, it is important to monitor for viruses and stem cankers, as well as a susceptibility to various fungal diseases.