El Salix atrocinerea It is one of the most interesting and versatile willow species you can see in nature and also choose to plant in a large garden. In addition to its ornamental and environmental value, it is characterized by its resistance and the many uses it has had historically. Would you like to know everything about the willow? In this article, we present a Complete guide with detailed and updated information about its origin, botanical characteristics, habitat, care, properties, ecological usefulness and much more.
Origin, distribution and habitat of Salix atrocinerea
El Salix atrocinerea, Popularly known as willow, burdaguera, black willow, willow, balsero or salgueiro, belongs to the Salicaceae family. It is a species widely distributed in Atlantic and Mediterranean Europe, with a special presence in the Iberian Peninsula, Portugal, Corsica, southern England and, in a separate manner, also in North Africa (Morocco and Tunisia).
Their preferred habitat It is concentrated in moist, sandy soils, especially on the banks of rivers, streams, lagoons, gullies, gravel pits and hedges where soil moisture is constant. It can grow from sea level up to 2.000 meters above sea level, ranging from coastal environments to subalpine zones. It is a pioneer species in human-altered habitats, rapidly colonizing degraded spaces and facilitating the emergence of new plant communities, thanks to its ease of propagation and adaptation to soils with poor soil quality, provided they maintain adequate moisture.
Botanical characteristics and morphology
El Salix atrocinerea can be presented as either vigorous shrub or as a medium sized tree, generally reaching between 12 to 22 meters tall at maturityIts growth is rapid and its bearing is upright, with a crown formed by long, straight and thin branches which, in older specimens, tend to intersect and present a somewhat disheveled appearance.
- La Cortex It is greyish-brown or dark brown in colour, and the wood has longitudinal ribs that are very visible when the bark is removed.
- The young branches They are densely hairy, while the adults become hairless and shiny.
- Leaves They are entire or with thick teeth, rough, ovate or lanceolate in shape, slightly wider at the apical part. When they sprout, they are felted and very hairy; over time, the upper surface loses its hairs and takes on a bright dark green tone, while the underside remains greyish and may have rusty hairs.
- Petioles 5 to 15 mm, channeled at the top.
A relevant feature of the species is its dioecious character, that is, there are male and female specimens. This influences the shape of their inflorescences:
- The flowers are grouped in very hairy catkins that appear before the leaves.
- The male catkins They are ovoid or ovoid-oblong, composed of numerous hairy bracts and stamens with yellow anthers loaded with pollen (highly visited by pollinating insects and birds).
- The female amenti They are cylindrical, somewhat longer, and each female flower has a pistil with a long style and four stigmatic lobes.
El fruit It is a tomentose capsule that, when ripe, splits open, releasing seeds covered in whitish hairs that facilitate their dissemination by wind (anemochory). The dispersal period is brief, and the seeds lose viability shortly after ripening.
Flowering and pollination of Salix atrocinerea
La flowering Salix atrocinerea is produced from late winter to early spring, which allows the species to take advantage of the first rains and the thaw. At that time, the hairy catkins emerge before the leaves and, thanks to the separation between male and female plants, pollination is mainly carried out by the wind, although other pollinator species also intervene. pollinating insects such as bees and certain birds.
- The male inflorescences They produce abundant pollen, visible and accessible to insects such as the Apis mellifera (honeybee) and the Xylocopa violacea (carpenter bee).
- In the female catkins, the nectaries attract insects that contribute to fertilization.
- This bloom provides early-season food for numerous pollinators, playing a key ecological role.
Hybridization capacity and genetic diversity
One of the distinctive aspects of the genre Salix is its great propensity for hybridization, which results in high genetic diversity and the appearance of numerous hybrids with other species of the genus. This can sometimes make precise identification difficult, but it also enriches the biodiversity of the ecosystems where willows grow.
Some of the recognized hybrids of Salix atrocinerea are:
- Salix × expectata: hybrid with Salix cantabrica
- Salix × quercifolia: hybrid with Salix caprea
- Salix × guinieri: hybrid with Salix cinerea
- Salix × mairei: hybrid with Salix pedicellata
- Salix × altobracensis: hybrid with Salix bicolor
- Salix × viciosorum: hybrid with Salix purpurea
- Salix × secalliana: hybrid with Salix salviifolia
- Salix × multidentata: hybrid with Salix trianda
- Salix × stipularis: hybrid with Salix viminalis
These hybrids can be found in natural environments, especially in areas where several willow species coexist and their distribution areas overlap.
Care and cultivation of Salix atrocinerea in the garden
Salix atrocinerea It's an excellent choice for spacious gardens, public parks, environmental restoration projects, and riverbanks. The following details the care requirements for its proper development:
Optimal location
Place your copy en outdoors, in full sun, although it also tolerates semi-shade, as long as it receives more hours of light than shade. You should plant it at a distance of at least 5-6 meters from buildings, walls or pipes due to its powerful root system, which can be invasive.
Soil and substrate
El ideal terrain for Salix atrocinerea It is fresh, deep, acidic or subacid, with good moisture retention capacity. Not suitable for permanent pot cultivation, since it requires space for the development of roots and canopy.
Irrigation and humidity
This willow demands frequent waterings, especially if the climate is dry or the specimen is young:
- In summer: every 2 days.
- The rest of the year: every 4-5 days.
The plant thrives in humid environments and can be key in stabilizing banks and areas prone to erosion.
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During spring and summer, it is advisable to provide organic fertilizer such as guano o herbivorous animal manure once a month. This will promote optimal growth, especially in nutrient-poor soils.
Pruning
Multiplication
Cuttings
Propagation by cuttings is very effective:
- Select healthy, one-year-old branches, about the thickness of a pencil and about 30 cm long.
- Remove the bark at the base (about 3 cm), moisten and impregnate with rooting hormones.
- Plant the cuttings in a porous substrate, such as perlite alone or mixed with black peat, and keep them moist, in the shade but outdoors.
Seeds
Propagation by seed is more complicated, as they lose viability very quickly. Remove the cottony fibers and soak them in water for 24 hours before sowing them in moist, aerated substrates, ensuring adequate light exposure.
Plagues and diseases
Despite its general resilience, may be attacked by:
- Aphids: small insects that are controlled with sticky traps or potassium soap.
- Mealybugs: cottony or limpet type, treatable with specific insecticide.
- Rust: fungus that creates reddish bumps and is controlled by fungicides.
- Oidium: A fungus that produces white powder on leaves; also treatable with appropriate fungicides.
Rusticity and climatic resistance
El Ashy willow withstands intense cold and frosts down to -17ºC. In addition, it tolerates periods of heat as long as there is enough moisture in the substrate.
Traditional, ornamental and ecological uses
Ornamental uses and gardening
El Salix atrocinerea It is valued as an ornamental tree for its appearance, shade, and its ability to create cool environments next to ponds, rivers, or large garden areas. It works both as a isolated specimen as in groups or lineupsGiven its tolerance to pruning, it is used in informal hedges and landscape repairs.
Ecological applications and bioengineering
Thanks to its rapid growth and regeneration capacity, Salix atrocinerea It is essential for the restoration of degraded land and the stabilization of slopes, embankments, and riverbanks. Its roots consolidate the soil and prevent erosion. It also provides shelter and food for numerous animals and microorganisms in the riparian ecosystem.
Basketry and crafts
The flexible branches of the ashy willow have been traditionally used for make baskets, bowls, jugs, mats, poles and utilitarian basketry itemsIts elasticity and strength make it still very valuable to artisans.
Medicinal properties and therapeutic uses
The gender Salix is known for his medicinal properties, derived especially from the salicin, a natural precursor to salicylic acid (the original component of aspirin). bark and leaves de Salix atrocinerea They have been used in traditional medicine as antipyretic, anti-inflammatory and analgesic. It has been prescribed to treat:
- Fevers
- Rheumatism and arthritis
- Drop
- Headaches
- Neuralgia, colic and certain digestive disorders
In addition, the plant contains more than 100 secondary metabolites with antioxidant, anti-inflammatory and analgesic effects.
Ecological importance, biodiversity and environmental benefits
Salix atrocinerea, in addition to its ornamental function and practical utility, plays a crucial role in environmental conservationIt is one of the first colonizing species following natural or human disturbances, helping to establish soil, providing shade and moisture, and improving the local microclimate.
- Its early flowers feed insects pollinators in periods of floral scarcity.
- Its roots strengthen riverbanks and prevent erosion. This protects not only the tree itself, but also the entire riparian ecosystem.
- It provides <strong>economic data</strong> on the business environment. habitat for birds, small mammals and invertebrates, enriching the biodiversity of riparian forests.
- It promotes the emergence of new plant species by modifying soil and microclimatic conditions.
Taxonomy, etymology and curiosities
- Family: Salicaceae
- Gender: Salix
- Order: Malpighials
- Species: Salix atrocinerea
The epithet «atrocinerea» It refers to the "dark ashen" appearance that young leaves and branches exhibit under light, due to their dense hairiness and grayish color. It was described by Félix de Avelar Brotero in his work "Flora Lusitanica."
- Chromosome number: 2n=76
- Synonymy: Salix cinerea var. atrocinerea (Brot.) O. Bolòs & Vigo
It has many popular names in different regions: zalce, bardaguera, sarga negra, salguero, salgueira, mimbre, ramal, salce, sarga, sauce prieto, among others. This variety of names reflects its presence and use throughout Iberian history and geography.
As occurs in most species of Salix, is also used in Bioengineering projects, living structures, pergolas or lattices for gardens and natural spaces. For more details on your care, see .
