Sticky woundwort: complete guide

Overview

Sticky woundwort (Stachys glutinosa) is a rare, low-growing aromatic subshrub belonging to the mint family Lamiaceae. Its natural range is remarkably restricted: it grows wild only on Corsica, Sardinia, and the small Italian island of Capri, making it a true Mediterranean island endemic. The species was described by Linnaeus himself in his Species Plantarum of 1753, and its name says everything about its most distinctive character: glutinosa means sticky in Latin, referring to the dense covering of glandular hairs on stems and leaves that produce a resinous, slightly tacky secretion. Touch the plant on a warm day and your fingers will carry the scent for hours - a rich herbal fragrance combining thyme, mint, and something uniquely resinous that evokes the Corsican maquis scrubland. At gardenworld.app you will find Mediterranean garden designs where aromatic Lamiaceae plants like this one take centre stage.

Stachys glutinosa belongs to the large genus Stachys, which also includes the popular woolly hedge-nettle (Stachys byzantina). It is distinguished from its relatives by its island-restricted distribution, its prominent glandular stickiness, and its preference for acidic, nutrient-poor rocky soils - unusual characteristics within a family that generally favours alkaline to neutral ground.

Appearance and bloom cycle

Stachys glutinosa forms a compact, low-spreading subshrub typically reaching 30 to 50 cm in height, with a spread of similar dimensions. The lower stems become slightly woody with age, while the upper portions remain soft and herbaceous. Every green surface - stems, leaves, and flowering spikes - is densely covered with glandular hairs that produce the plant's characteristic sticky coating. The leaves are oblong to oval, 2 to 5 cm long, slightly wrinkled on the upper surface and softly hairy beneath, with a strong aromatic scent when handled or in warm weather. The flowers appear from May through July in rich spikes along the upper stems. They are two-lipped and tubular, typical of the Lamiaceae, and vary in colour from white to pale blue or soft lavender, sometimes with pink tints. The flowers are larger and showier than those of many other Stachys species and are particularly attractive to bumblebees and butterflies. After flowering, the plant sets small nutlets in the persistent calyx, characteristic of the mint family.

Ideal location

A warm, sheltered, sunny position is essential for sticky woundwort. The species is adapted to the Mediterranean island climate: hot dry summers, mild moist winters, and sunshine for most of the year. In north-western European gardens, it needs the warmest, most sheltered spot you can offer: a south-facing wall, a sheltered courtyard, or a dry border in an urban garden. Aim for at least six hours of direct sunlight per day. The plant tolerates heat well but needs protection from cold northerly winds and extended frost periods. In colder parts of the UK, the Netherlands, and Belgium, growing in a large pot that can be moved indoors for winter is often the most practical approach.

Soil requirements

The soil preferences of Stachys glutinosa are unusual for a Lamiaceae: it prefers a distinctly acid pH of 5.0 to 5.5, combined with light, free-draining, nutrient-poor ground. Most members of the mint family prefer neutral to alkaline soils, so this species is a notable exception. In the garden, use a mix of ericaceous compost, sharp sand, and perlite in a 2:1:1 ratio. Avoid adding lime, and avoid standard multi-purpose composts which are usually too alkaline. Rhododendron or azalea fertiliser is more suitable than general-purpose plant food. The soil must drain freely at all times: wet roots, particularly in winter, are almost invariably fatal.

Watering

Sticky woundwort is adapted to Mediterranean summer drought and needs relatively little water once established. In the first growing season after planting, water regularly to help the plant establish. After that, water only during prolonged dry periods lasting more than two to three weeks. In wetter, cooler climates, the greater danger is too much winter moisture rather than summer drought. Avoid wetting the sticky stems and foliage when watering, as moisture on the dense glandular hairs encourages fungal disease. Drip irrigation at the base of the plant is far preferable to overhead spraying. In pots, make sure drainage holes are clear and use a very free-draining substrate.

Pruning

Regular light pruning keeps sticky woundwort compact and promotes repeat flowering. After the main flush of bloom in July, cut the flowered stems back by roughly one third to two thirds of their length. New side shoots will develop and the plant will remain bushy and well-shaped. In early spring, remove any winter-damaged or dead stems as soon as new growth appears at the base. Avoid cutting deeply into the woody lower framework, as this species regenerates less vigorously than some relatives when its woody base is damaged. In mild years, a light trim in autumn can also help to keep plants tidy through the winter months.

Maintenance calendar

January and February: protect from frost below -5 degrees Celsius using fleece or bring pots indoors. Check that soil or compost is not completely dry during frost-free spells. March: remove frost-damaged shoot tips as new growth swells at the base. April: apply a modest dose of acid fertiliser (rhododendron feed) to support the new season's growth. May: first flowers open; no special action needed. June and July: peak flowering period; deadhead or lightly trim after the main flush. August: the plant rests after flowering; water only during extended dry spells. September and October: stop feeding; prepare frost protection for colder areas. November and December: minimal watering; bring pots indoors if hard frost is expected.

Winter hardiness

Stachys glutinosa is half-hardy, tolerating light frost down to roughly -5 degrees Celsius but not sustained severe cold. In its native Corsica and Sardinia, hard frosts are rare, so the plant is not adapted to prolonged freezing conditions. In the UK, the Netherlands, and Belgium, it needs protection in most winters unless grown in a particularly sheltered spot. The most reliable approach in colder climates is pot cultivation: move pots into a cool but frost-free space such as a conservatory, unheated greenhouse, or garden shed from November onwards. Return them to their outdoor position in April once the frost risk has passed. Outdoors, a thick covering of dry straw or horticultural fleece around the base provides reasonable protection in milder winters. At gardenworld.app you can find detailed design advice for cultivating tender and half-hardy Mediterranean plants in north-western European conditions, including overwinter strategies.

Companion plants

Sticky woundwort is most at home in a Mediterranean or island-themed planting. Cistus species, with their papery single flowers in white, pink, and magenta, share its preference for acid to neutral, dry, and free-draining soils. Rosemary (Salvia rosmarinus) provides similar aromatic character and useful shelter as a low windbreak. Lavender (Lavandula angustifolia) is another Lamiaceae companion that complements the blue tones of the Stachys flowers with its own purple spikes. At a lower level, thymes make fragrant ground cover with similar cultural requirements. The overall effect is a highly aromatic, bee-friendly Mediterranean corner that evokes the scented scrubland of the Tyrrhenian islands. Check with specialist garden centres for availability; sticky woundwort is not commonly stocked but can be found through Mediterranean plant nurseries. At gardenworld.app we can incorporate rare Lamiaceae plants like this into a custom garden design tailored to your space.

Closing thoughts

Sticky woundwort is a plant for the botanically curious and the lover of Mediterranean flora. Its rarity in cultivation, its remarkable sticky fragrance, and its elegant blue-white flowers make it a genuinely special find. It is not the easiest plant to grow outside its native range, but the effort of providing the right acid, free-draining soil and adequate winter protection is well rewarded by a plant that brings a breath of the Corsican maquis to even the most urban garden. For those who want a garden that tells a story and celebrates the botanical treasures of island Europe, Stachys glutinosa belongs on the wish list.