Picture: Stock flower Under Cultivation
Stock flower (Matthiola incana), commonly known simply as stock or gillyflower, is one of the most deliciously fragrant and classically beautiful of all cool-season flowering plants, belonging to the cabbage family Brassicaceae and native to the rocky coastal cliffs and hillsides of southern Europe and southwestern Asia.
Cultivated in European gardens for over five centuries, stock has been treasured by generations of gardeners primarily for its extraordinary, clove-like fragrance — a rich, warm, spicy-sweet scent that perfumes the evening garden with incomparable intensity and that many gardeners and perfume lovers consider among the most beautiful and evocative natural fragrances produced by any flowering plant anywhere in the world.
The flowers of stock are produced in dense, upright spikes of tightly packed, four-petaled blooms in a beautiful range of colors including pure white, cream, soft yellow, pale pink, deep rose, red, lavender, purple, and rich burgundy, making them outstanding and long-lasting cut flowers as well as beautiful garden plants. Both single and double-flowered forms are available, with the fully double varieties — in which all the stamens have been converted to additional petals — being the most commercially valued and widely grown for the cut flower trade, as their dense, opulent flower spikes have a lush, romantic quality that makes them particularly popular for wedding flowers and luxury floral arrangements.
Stock is a cool-season flowering plant that performs at its absolute best during the moderate temperatures of spring and autumn, when its flower production is most prolific and its fragrance is most intense and far-reaching. As temperatures rise in summer, stock plants tend to flower less freely, become more susceptible to disease, and eventually run to seed, making them best treated as spring or autumn flowering plants in most temperate climates rather than as summer bedding plants. In mild, frost-free winter climates, stock can be grown as a winter-flowering annual that provides invaluable fragrance and color during the months when the garden is otherwise at its most quiet and colorless.
Stock flower carries a long and distinguished history in European horticulture and culture, having been cultivated in monastery gardens, cottage gardens, and formal pleasure grounds since at least the 16th century when it was widely known by its evocative old common name gillyflower — a name it shared with carnations and wallflowers, all of which were prized above all else for their exceptional clove-like fragrance. Stock appeared prominently in the writings of the great English herbalist John Gerard, who described it with admiration in his famous Herball of 1597, and it has been a beloved fixture of English cottage garden tradition ever since.
Beyond its ornamental garden value, stock flower has been used in traditional and folk medicine across several European cultures for centuries, with various preparations made from the flowers, leaves, and seeds employed as treatments for a range of ailments including respiratory complaints, skin conditions, and nervous system disorders.
The seeds of stock contain significant quantities of glucosinolates — the same sulfur-containing compounds found in other members of the Brassicaceae family — which have been the subject of modern scientific research into their potential anti-cancer and anti-inflammatory properties, giving this ancient garden plant a new dimension of contemporary scientific interest and relevance.
Stock flower holds a cherished place in the world of perfumery, where the complex, warm, spicy-sweet fragrance of the flowers has inspired and influenced perfumers for centuries. The scent of stock is notoriously difficult and expensive to capture through distillation or solvent extraction, meaning that most commercial stock fragrances are created synthetically or by blending other fragrant materials to approximate the flower’s characteristic scent profile.
Despite this commercial challenge, stock remains one of the most frequently cited floral inspirations among perfumers, and its fragrance note appears — in natural or reconstructed form — in a significant number of high-quality floral and oriental perfume compositions worldwide.
Picture: Stock Flowers In Arrangment
How to Grow Stock Flower From Seed
- Choose the Right Variety for Your Purpose — Before sowing, select a stock variety suited to your specific growing goals and garden situation. Column or excelsior stocks produce tall, single-stemmed spikes ideal for cutting, while dwarf bedding stocks form compact, bushy plants better suited to containers and border edging. Ten-week stocks are among the fastest from seed to flower, while brompton stocks are biennials that overwinter and flower in spring. Understanding the differences between these groups allows you to choose the variety most likely to deliver the flowering display you are hoping to achieve within your available growing season.
- Source Fresh, Quality Seeds — Purchase the freshest possible stock seeds from a reputable supplier, as fresh seeds germinate considerably more reliably and vigorously than old or poorly stored seeds. Stock seeds are relatively short-lived compared to some other flower seeds and should ideally be used within one to two seasons of their harvest date for the best possible germination results. Check the seed packet date carefully before purchasing and store any unused seeds in a cool, dry, dark location in a sealed container to maximize their viability until the next sowing opportunity.
- Start Seeds at the Right Time — The timing of stock seed sowing is critically important to achieving the best possible flowering display. For spring flowering, sow seeds indoors in late winter — from January through February in temperate climates — eight to ten weeks before the last expected frost date. For autumn flowering in mild climates, sow in midsummer. For overwintering brompton stocks that flower in spring, sow in late summer. Getting the timing right ensures that plants reach their flowering stage during the cool temperatures that bring out the best performance and the most intense fragrance in stock flowers.
- Prepare Seed Trays With Fine Compost — Fill seed trays or small pots with a fine, well-draining seed-starting compost that has been thoroughly moistened before use. A light, free-draining compost is important for stock seeds, as these seeds — like all members of the Brassicaceae family — are sensitive to waterlogging at the germination stage and will quickly rot if the growing medium becomes saturated and poorly aerated. Firm the compost surface gently to create a smooth, even sowing surface of consistent density that supports uniform germination across the entire tray.
- Sow Seeds on the Surface — Stock seeds are small and require light to germinate, so they should be sown on the surface of the moistened compost rather than being covered with soil. Sprinkle seeds as thinly and evenly as possible across the compost surface, spacing them approximately half an inch apart to minimize competition between germinating seedlings. After sowing, press seeds very gently but firmly onto the compost surface using a flat piece of card or the bottom of another pot to ensure good seed-to-compost contact without burying them beneath the surface of the growing medium.
- Provide Cool Temperatures for Germination — Unlike many other annual flower seeds that require warmth for reliable germination, stock seeds germinate best at relatively cool temperatures of 60–65°F (15–18°C). Exposure to temperatures above 75°F (24°C) during the germination period can actually inhibit stock seed germination and produce poor, uneven results. This cool germination requirement is one of the most important and distinctive characteristics of stock propagation and distinguishes it clearly from warm-season annuals that need heat to germinate — a cool windowsill or unheated propagator works better than a heated one for stock seeds.
- Maintain Moisture and Light — After sowing, place seed trays in a bright location — stock seeds need light to germinate — and cover with a clear propagator lid or plastic wrap to maintain consistent moisture around the seeds during the germination period. Check moisture levels daily and mist the compost surface gently whenever it begins to dry out, using a fine spray bottle to avoid displacing the surface-sown seeds. Remove the cover briefly each day to ventilate and prevent excess condensation from building up on the inside of the cover, which can drip back onto the seeds and potentially cause fungal issues.
- Expect Quick Germination — Stock seeds are among the more reliable and prompt germinators among cool-season annual flowers, typically producing their first seedlings within seven to ten days of sowing under suitable cool, moist, well-lit conditions. This relatively quick germination is one of the pleasures of growing stock from seed, providing early encouragement and confirmation that the sowing process has been carried out correctly. Once the majority of seedlings have emerged, remove the propagator cover gradually over two to three days to acclimatize the seedlings to ambient humidity and temperature conditions.
- Identify and Select Double-Flowered Seedlings — One of the most fascinating and practically useful techniques in stock cultivation is the early identification and selection of seedlings that will produce the more desirable double flowers, rather than the less showy single-flowered forms. At the cotyledon stage — when seedlings have just their first pair of seed leaves — double-flowered seedlings of many stock varieties can be identified by their slightly lighter, more yellowish-green cotyledon color compared to the darker, more intensely green cotyledons of single-flowered seedlings. Selecting the lighter-colored seedlings and discarding the darker ones significantly increases the proportion of double flowers in the final planting.
- Prick Out Seedlings at the Right Stage — When stock seedlings have developed their first pair of true leaves and are large enough to handle safely, carefully prick them out individually into small pots filled with good quality, free-draining multipurpose potting compost. Handle seedlings by their leaves rather than their fragile stems during this operation, and take care to maintain the seedlings at the same depth they were growing in the seed tray rather than burying them deeper or leaving roots exposed. Water gently after potting and return to cool, bright conditions to recover from the disturbance of transplanting.
- Grow On in Cool Conditions — After pricking out, grow stock seedlings on in cool, bright conditions — ideally between 45–60°F (7–15°C) — that reflect the plant’s fundamental preference for cool growing temperatures. A cool greenhouse, unheated polytunnel, or cold frame provides near-ideal conditions for growing on stock seedlings during the late winter and early spring weeks between pricking out and outdoor planting time. Avoid growing stock seedlings in excessively warm indoor conditions, which produces soft, weak, heat-stressed plants that perform poorly when eventually moved to cooler outdoor conditions at planting time.
- Begin Feeding Seedlings Regularly — Once stock seedlings are well established in their individual pots and growing actively with clearly visible production of new leaves, begin feeding every two weeks with a balanced, water-soluble liquid fertilizer diluted to half the recommended strength. As plants develop further and begin to show visible flower bud development, switch to a fertilizer with a slightly higher potassium content to encourage strong stem development, robust root growth, and the production of the large, dense, fragrant flower spikes that make stock such an outstanding and rewarding cut flower and garden plant.
- Harden Off Carefully Before Planting Out — Before transplanting stock seedlings to their permanent outdoor growing position, harden them off gradually over a period of ten to fourteen days by placing them outside in a sheltered position for increasing periods each day, gradually building up their exposure to direct outdoor sunlight, wind, and the cooler outdoor temperatures that prevail in early spring. Stock is considerably hardier than many other spring bedding plants and can tolerate light frosts once hardened off, but sudden exposure to harsh outdoor conditions without adequate hardening can still cause significant setbacks and delay flowering noticeably.
- Plant Out in the Right Position — Plant hardened-off stock seedlings into their final growing position in full sun or very light shade, in well-drained, moderately fertile soil with a slightly alkaline to neutral pH that suits the plant’s brassica family preferences. Space plants nine to twelve inches apart for bedding varieties and twelve to fifteen inches apart for taller cutting varieties to allow adequate airflow between plants, which helps reduce the risk of the fungal diseases — particularly downy mildew — that can affect stock in humid conditions with poor air circulation around the foliage and stems.
- Maximize Fragrance by Planting Strategically — To fully appreciate and enjoy the extraordinary fragrance of stock — which is most intense in the evening and at night — plant it in positions where the scent can be experienced most easily and most pleasurably. Plant near windows, doorways, garden seating areas, and along paths and walkways where people pass regularly and the rising warm air of the evening carries the rich, spicy-sweet perfume most effectively. A few well-placed stock plants near a frequently used garden seat or patio can transform the entire outdoor experience on warm spring and early summer evenings, filling the air with one of the most beautiful natural fragrances any garden can offer.