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Horned Pansy (Viola cornuta)

Viola cornuta is a low-growing evergreen perennial herb with a clumping to spreading habit that can form ground cover, with stems that may creep or grow obliquely upward. It is a perennial herb but may also be grown horticulturally as an annual; sources describe this differently.

LightIt grows in full sun to partial sun; insufficient light may lead to elongated, weak growth and reduced flowering.
WaterKeep the soil moist but well drained, avoiding prolonged waterlogging or continual exposure to rain.
TemperatureA single source reports a minimum temperature of about -15 °C, and the few available data give an ideal range of about 10–25 °C. A single source also reports a USDA hardiness classification.
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Horned Pansy illustration

Overview

Viola cornuta is a low-growing evergreen perennial herb with a clumping to spreading habit that can form ground cover, with stems that may creep or grow obliquely upward. It is a perennial herb but may also be grown horticulturally as an annual; sources describe this differently.

Origin and habitat

Sources differ on its native range: the core distribution is given as the Pyrenees and the Cantabrian Mountains of northern Spain, while some accounts extend it to mountainous areas of southwestern Europe in France, Andorra, and Spain. It occurs mainly in montane to alpine and subalpine environments, including mountain meadows, pastures, grasslands, and rocky places. It is adapted to temperate and cool mountain environments; information from Taiwan describes it as preferring a cool climate and growing there mainly in winter and spring.

Characteristics

Sources differ on mature height, placing it at about 20–30 cm, while mature spread is 10–50 cm. Growth is reported to be rapid, and the green leaves are mainly ovate with crenate or shallowly crenate margins; some descriptions also note pointed tips, hairy undersides, rounder lower leaves, and more ovate upper leaves. The solitary, fragrant flowers have narrow petals and a conspicuous slender spur; the species is mainly purple, pale purple, or blue-purple, while horticultural varieties and hybrid lines include additional flower colors. Flowering varies markedly with climate, with European information describing flowering mainly from spring into summer and sometimes later, while cultivation information from Taiwan gives winter and spring as the main flowering period; the fruit is reported to be a blunt capsule that splits along seams when mature, with seeds that may be dispersed by ants.

Light

It grows in full sun to partial sun; insufficient light may lead to elongated, weak growth and reduced flowering.

Watering

Keep the soil moist but well drained, avoiding prolonged waterlogging or continual exposure to rain.

Temperature and dormancy

A single source reports a minimum temperature of about -15 °C, and the few available data give an ideal range of about 10–25 °C. A single source also reports a USDA hardiness classification.

Growing medium and mounting

It is suited to fertile, humus-rich soil that remains moist but drains well, including sandy, loamy, clay, or calcareous soils; information from Taiwan also recommends deep, fertile sandy soil. Some sources indicate that slightly acidic to approximately neutral soil is suitable and that excessively high pH may cause yellowing.

Propagation

It can be propagated by seed or by division in spring or autumn; information from Taiwan recommends sowing from autumn into winter.

Common problems

Possible pests include slugs, snails, aphids, greenhouse red spider mites, and violet gall midges. Reported diseases include powdery mildew, pansy leaf spot, viral disease, rust, and southern blight of herbaceous ornamentals; Puccinia violae is a known pathogenic fungus of Viola cornuta. Prolonged summer heat can reduce flowering, insufficient light can cause weak elongated growth and reduced flowering, prolonged rain can lead to petal rot or disease, and excessive warmth during sowing can impair germination. It prefers cool weather, with sustained heat suppressing flowering; it tolerates some cold, and some horticultural information also describes tolerance of brief frost.

Identification

Viola cornuta is reported to have narrow petals and a prominent slender floral spur, with the species bearing mainly purple or pale purple flowers; compared with common small-flowered pansy-type hybrids, its petals are narrower and its flower coloration is simpler.

Photos

Viola cornuta
📷 Isidre blanc · CC BY-SA 4.0 · source
Viola cornuta
📷 Joan Simon, some rights reserved (CC BY-SA) · CC BY-SA · source

Sources