Viola yedoensis Seeds | Herba Violae
LATIN NAME: Viola yedoensis
COMMON NAME: Yedo Violet
Plant Profile
Chasmogamous and cleistogamous flowers are the standard division of labour in this genus. The open spring flower with its pale spur and gold throat is the showy, outcrossing phase; the closed summer flower is a sealed capsule of stamens and stigma wrapped in a bud that never unfurls. Rain, drought and a shortage of bees cannot interrupt the second phase.
The mature capsule dries and throws its seed a short distance, and each seed carries a small, oily appendage called an elaiosome. Ants carry the seed back to the nest for that food body, eat the appendage and dump the seed intact in their refuse heap, which is usually richer and better drained than the parent’s patch. This dispersal partnership is why the plants move in slow, expanding fronts.
Identification is genuinely difficult, and the reason is that the species is only one element of a variable East Asian group. Leaf width, hairiness, spur length and flowering time grade into one another across V. philippica, V. mandshurica and their relatives, and different authorities have drawn the boundaries differently over the past century.
Unlike the alpine violets of mountain scree, this one is a plant of the working landscape. It turns up on bunds between paddy fields, on the shoulders of footpaths, in graveyards and in thin grass under orchard trees, always on ground that is open, mildly disturbed and seldom waterlogged. It tolerates mowing and light trampling better than most of its relatives.
Established clumps divide easily in early spring, just as new growth shows at the crown, and division is the quickest way to fill a border. Water in dry spells during the first season, then let the plants find their own level. Slugs are the main nuisance on damp ground, and the closed summer flowers will scatter seed freely into any nearby gravel.
Science & Biotechnology
Violas make cyclotides, small circular peptides whose backbone is stitched into a knot of three disulphide bridges. The fold makes them unusually resistant to heat and to digestive enzymes, and the cycloviolacin family named from violets is among the best studied groups. Work on these peptides has moved through structural chemistry and into crop-protection research.
The flower reads as deep violet because of anthocyanin pigments sitting over a yellow base, and the yellow itself is largely carotenoid. Violaxanthin is part of the xanthophyll cycle that protects photosynthetic tissue from excess light, a job that matters in the open, sunlit sites this violet prefers. The visible colour and the protective chemistry come from the same molecular family.
Uses & Benefits
The scent of a violet is a fragrance-industry reference point. Ionones, especially beta-ionone, carry the sweet, slightly powdery note that perfumers label violet, and the compound is closely related to the carotenoid pigments that also give the flower its colour chemistry. Alpha-ionone and violaxanthin, the xanthophyll named for the genus, sit in the same biochemical neighbourhood.
In Chinese practice the entire plant is collected during the spring flush, roots, leaves and open flowers together, and dried in shade so the colour is retained. The material is used externally as a poultice and in washes, and it appears in compound formulas rather than on its own. Fresh material is preferred where it can be had.
The violet’s old reputation is as a cooling herb applied to hot, angry skin, and it has been used on boils, mastitis and insect bites. Farmers in southern China recognised the plant as a field-side medicine long before it entered the dispensaries, and the dried herb still appears in the trade under the name of the purple flower. It is a hardy, unglamorous plant with a long practical history.
Growing from Seed
Use a humus-rich mix of two parts leafmould, one part garden loam and one part grit, and sow on the surface with only a whisper of fine compost over the top, since the seed needs light. Keep the tray moist and shaded. Space plants about fifteen centimetres apart, or simply let the mat fill in, and move seedlings out once they have four true leaves.
Our Take
Set this violet at the front of a bed where you will actually notice the spring flowers, and let the quiet summer phase run its course rather than cutting the mat back. It makes a natural companion for the larger garden violets such as horned violet, and it will seed around happily beside wild pansy. Growers working through the East Asian group should also compare Viola philippica, which is often confused with it, and try King Henry if a larger flower is wanted in the same corner.
Related Reading
More species in the same orbit as Yedo Violet: