Purple willow
Salix purpurea
Salix purpurea is a deciduous shrub reaching up to 6 meters in height, characterized by its flexible, often reddish or purple-colored twigs. Uniquely for the Salix genus, its leaves are frequently arranged in an opposite or sub-opposite manner. It prefers moist habitats such as riverbanks, gravel bars, and floodplains, exhibiting a high tolerance to periodic flooding. Flowering occurs in early spring before the leaves emerge, presenting as slender catkins that often have a reddish tint.
Details
Oxygen production
Produces oxygen through photosynthesis during the growing season.
Habitat function
Provides nesting sites for shrub-nesting birds and serves as a habitat for numerous specialized beetle and butterfly species.
Nutrient uptake
High uptake of nitrogen and phosphorus from the riparian zone and groundwater.
Food source for
Wild bees, honey bees, larvae of the Smerinthus ocellatus, beavers.
Human use
Basket weaving (extremely tough rods), bioengineering for bank stabilization, extraction of salicin for medicinal purposes.
Ecology
Ecological role
Pioneer species along watercourses, contributes to bank stabilization and serves as an early forage plant for insects.
Natural predators
Browsing by wildlife (deer), beavers, various specialized insect larvae.
Competitor species
Other willow species (e.g., Salix viminalis), alders, and invasive neophytes such as Japanese knotweed.
Ecosystem service
Erosion control through intensive root systems, filtering of sediments in floodplains, provision of pollen for pollinators.
Threats
River channelization, loss of retention areas, lowering of the groundwater table.