Matthiola incana Seeds | Violet / Stock
LATIN NAME: Matthiola incana
COMMON NAME: Violet / Stock
Plant Profile
The most reliable way to tell a stock from any other border flower is to stand beside it after sunset. The clove-and-spice perfume that is barely present at noon suddenly fills the air, a timing trick the plant uses to draw night-flying moths toward its dense racemes. Few garden annuals reverse their scent so completely between noon and night, and the change is strong enough that a visitor who dismisses the plant at lunchtime will be stopped by it after dinner.
This evening switch is the trait that makes stock a plant of the path edge and the open window rather than the back of a border, because the scent only does its work after dark.
The double-flowered habit gardeners prize is controlled by a single dominant allele, and because doubled plants trade their sex organs for petals they set no seed of their own. That is why the showiest stocks in commerce are carried as cuttings or shoot cultures rather than raised from the pod, while the single types still breed true from the siliqua. It also means a double bed is silent for bees, since there is no pollen or nectar left to offer.
Because doubled clones cannot be raised from their own seed, nurseries hold elite lines as shoot-tip cultures and rooted cuttings. Meristem culture also cleans stock of turnip mosaic virus and other pathogens that otherwise creep through a cutting bench, giving uniform, virus-free transplants for the bedding trade. The same technique lets a single prized colour be held year after year without drifting.
The night perfume is a blend of benzenoid compounds, methyl benzoate, benzyl benzoate, eugenol, isoeugenol, methyl salicylate and phenylacetaldehyde among them, released in larger amount after dark. Breeders screen for a stronger benzenoid profile the way rose breeders screen for damascenone, because the scent is the trait that keeps stock in the cutting garden.
Science & Biotechnology
Matthiola incana is a short-lived perennial almost always grown as a biennial or a cool-season annual. Stems are erect and much branched, carrying lance-shaped, grey-green leaves coated with a mealy farinose bloom that rubs off on the fingers. Flowers sit in tight terminal racemes, and each bloom carries four petals. In the cultivated double forms the stamens and pistil are replaced by extra petals, so a fully doubled head is all petal and no working flower. The seed vessel is a slender siliqua that splits to shed small, flattened, winged seeds. The species is diploid at 2n = 14, a low count that helps breeders read chromosome behaviour in the doubled lines.
Uses & Benefits
Stock spans several garden jobs at once. It is a mainstay of the annual border, a long-lasting cut flower for the vase, and a potted specimen for cool conservatories. The single types feed moths and bees; the doubles are pure ornament for the front of a bed, and a row of them will perfume a whole patio once the sun goes down.
“Gillyflower” is the old English rendering of July-flower and was once applied to any clove-scented bloom. The stock was the gillyflower of Elizabethan knot gardens, tucked into nosegays and strewing mixes for its staying perfume, and the name still turns up in heritage-seed catalogues as a flower prized for its staying perfume.
Growing from Seed
Two traditions run through stock breeding. The annual-flowering group is sown and flowered within a single cool season for bedding, while the “Brompton” and “East Lothian” lines are perennials treated as biennials, sown one season and flowered the next for taller, longer-lasting spikes. Selection favours stem length, colour range, and above all the strength of the evening scent, because a stock that smells of nothing by night is a stock nobody replants.
Stock is best started where nights stay cool, because heat pushes the plants straight to leaf and short stems, and a stressed plant loses the scent that is its whole point.
Seed is fine and needs light to emerge, so press it onto the surface of a fine, free-draining sowing medium and leave it uncovered. Keep the medium just moist in a bright, cool place and shade it from hot sun, because a crusted or baked surface keeps the tiny seedlings from breaking through.
When seedlings reach about 5 cm in height, move them to their own cells, then set them out once they stand 10 to 12 cm tall, spacing plants 20 to 25 cm apart so air moves through the grey foliage and the racemes have room to lengthen. Pinch the tip of a biennial once to push it into a bushier shape before it runs to flower.
Our Take
Stock rewards a cool bench and a light hand with water more than any fertiliser trick. I keep mine on the north side of the greenhouse so the scent builds by evening, and I always start a few extra singles for the bees. If you want related cut flowers for the same season, look at the heartsease at Viola tricolor, the clove pink at Dianthus caryophyllus, and the snapdragon at Antirrhinum majus.
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