Stock
Also known as
Gillyflower, Brompton stock, Hoary stock, Common stock
Keep this plant’s care guide close at hand.
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Matthiola incana, commonly called stock, is a cool-season ornamental from the Mediterranean Basin prized for its spicy, clove-like fragrance and showy spring flowers. A short-lived perennial often grown as an annual or biennial, it forms upright, leafy stems bearing dense terminal racemes of four-petaled blooms in white, pink, lavender, purple, and rose; many cultivars feature fully double, ruffled flowers valued in cutting gardens. The foliage is gray-green to silvery, softly downy (hoary), and often oblong to lanceolate. Plants typically reach 30–80 cm tall, sometimes taller in rich soil. Stock thrives in cool weather, producing its best color and scent with bright days and cool nights. While tolerant of coastal conditions and mild frost, it dislikes heat and prolonged humidity. It prefers well-drained, moderately fertile, slightly alkaline soils and steady moisture without waterlogging. Deadheading can extend bloom, and staking may be needed for taller selections. Susceptible to brassica diseases such as clubroot and downy mildew, stock benefits from good air circulation, crop rotation, and careful watering at the base.
Taxonomy
Properties & Requirements
How to care for Stock
Water
Keep soil evenly moist but never saturated. Water deeply at the base when the top 1–2 cm of soil feels dry, allowing excess to drain freely. Morning watering helps foliage dry quickly and reduces Botrytis and mildew. Container-grown plants may need more frequent watering, especially in breezy conditions. Avoid overhead irrigation during bloom where possible, and mulch lightly to moderate evaporation while preserving good air circulation at the crown.
Light
Provide full sun in cool to mild climates for strongest stems and best bloom (6+ hours of direct light). In regions with hot afternoons, offer bright morning sun with light afternoon shade to extend flowering. Indoors, a bright, cool window or greenhouse bench with strong light and good airflow works best. Too much shade yields lanky growth and sparse flowers; excessive heat in full sun shortens the bloom period.
Nutrients
Feed lightly but regularly during cool active growth. Mix a slow-release, low-nitrogen, higher-phosphorus fertilizer (e.g., 5-10-10) into the planting area, then supplement every 3–4 weeks with a dilute liquid bloom fertilizer. Excess nitrogen promotes soft growth and fewer flowers, so err on the lean side. Incorporate compost for steady nutrition and better drainage, and ensure micronutrients (especially boron and calcium) are available to prevent bud abortion and weak stems.
Temperature
Stock flourishes with cool days and cooler nights: ideal daytime temperatures are about 12–18°C and nighttime 5–10°C. It tolerates light frost once established but should be protected from hard freezes. Prolonged heat above ~24–27°C reduces scent and flower quality and may halt flowering. Grow as a fall–winter–spring plant in mild climates or a spring plant where summers are hot. Avoid warm, stagnant indoor conditions; provide fresh air without cold drafts.
