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Artist1 Japanese knotweed (Reynoutria japonica) Japanese knotweed is a large, fast-growing herbaceous perennial known as a highly aggressive and destructive invasive species in Europe and North America because its deep root system (rhizomes) can damage foundations, roads, and native plants. The perennial is three to four meters tall and spreads in huge patches on riverbanks. There, it grows so densely that it completely crowds out native plants. It dies down in winter, so during flooding, the soil is eroded. The plant has thick, smooth, hollow stems that are tinged dark red. The broadly ovate, heart-shaped, light-green, 20-cm-long leaves are alternate and have a tube enclosing the base of the following stem limb. Perennial knotweed is increasingly invading arable land. Sustainable control of knotweed is very difficult, costly and lengthy, and there is also currently no consensus on the best method for controlling knotweed. The image shows a close-up look into a thicket of Japanese knotweed down a river slope, with a jumble of leaves and stems filling the picture. The silvery-blue water of the stream below is partly visible through the stems and leaves. The image is styled as a diaphanous, wet-on-wet watercolor, with delicate lines bordering the leaves and stems to separate the leaves and stems from each other visually. The delicate greens, blues, and silver with tinges of red in the knotweed stems create a lovely and harmonious ensemble that belies the aggressively invasive nature of the plants. The watercolor is executed with extreme scientific precision.
A detailed watercolor illustration depicts a dense thicket of invasive Japanese knotweed along a river slope. Translucent green leaves, hollow stems with red tinges, and delicate line work create a harmonious scene overlooking a silvery-blue stream, capturing the plant with scientific precision.