Torenia fournieri aka Bluewings

Torenia fournieri is a small annual in the Linderniaceae family. Its common names include wishbone flower and bluewings. Its native range runs from India to southern China and Indochina, including Taiwan. It grows in a wet tropical climate in its native range. In gardens, it forms a low, bushy plant with spreading growth. It reaches its full size within one growing season.

Garden plants stand about 0.5–1.6 feet [0.15–0.5 metres] tall. Reported widths range from about 0.5–1.6 feet [0.15–0.5 metres]. NC State gives a narrower spread than the RHS. The pale green leaves grow in opposite pairs. Each simple leaf has an oval outline and toothed edges. Leaves reach about 0.25 feet [0.08 metres] long. The green stems are round and lack a scent. NC State records no hairs on the foliage.

Flowers last through summer and into autumn. Each tubular bloom opens into two lips. The flowers combine purple, violet, blue, or white tones. A yellow mark sits at the throat. Two stamens meet at their anthers, forming the namesake wishbone. This small detail gives the plant its best-known common name. The long flower season suits beds and small containers. NC State lists no fruit in its plant profile.

Give this plant rich soil that stays moist but drains well. The RHS accepts chalk, clay, loam, and sandy soils. It recommends slightly acidic soil, though its profile allows other pH levels. Light advice varies with the source and growing conditions. The RHS favours sun and also allows partial shade. NC State favours partial sun or shade, especially during hot summers. Mulch helps keep the roots cool. Feed through the growing season, as the RHS advises. Plant outdoors only once the risk of frost has passed. Its RHS hardiness rating is H2; it cannot survive freezing.

Use wishbone flower along bed edges or near the front of shaded borders. It also suits window boxes, hanging baskets, and patio pots. Pruning is not essential, but pinching helps keep growth bushy. Cut straggly plants back by half to encourage fresh growth and flowers. Seeds and stem cuttings offer ways to raise new plants. Avoid disturbing roots when moving seedlings into the garden. Serious pest problems are not usual, according to Missouri Botanical Garden. Still, slugs, snails, and aphids may attack it. Root rot and powdery mildew can also occur.