Plant tall trees adjacent to infested margins to shade out weed, and deepen water if possible to prevent growth. An identifying feature of weedy yarrow is its feathery, fern-like leaves growing on the erect stems. There are barbs on the wavy edges of the leaves. They can be identified by their leaves, which can grow up to 15 inches long. Plant Species: Carduus nutans Another thistle on this list is the musk thistle, or nodding thistle. The huge white flower clusters grow at the end of tall stems. Musk Thistles have purple flowers when in bloom. Raise water level if possible for 2-3 weeks to drown the weed. Common yarrow is a tall white-flowering weed with large flat-topped clusters of tiny creamy-white flowers. Lower water level if possible and mechanically remove.ĥ. Spray terrestrial sites: triclopyr 600 EC (30ml/10L) or triclopyr 120g/L (15ml/L). Start at top of infestation, leave 3-4 months.Ģ. Start control work at margins to prevent further seeding, and work downstream where possible.ġ. Invades wetlands, lakesides, streams, swamps, bogs that are damp in winter and drier in summer, and creeps onto dry margins. Destroys wetland and marginal habitats and food sources for many fish and bird species, and causes blockages and flooding. Leaves are 2-5 inches long, lance-shaped and whorled on the stems. What damage does it do?įorms massive, tall, impenetrable stands, excluding all other species. Purple loosestrife produces multiple four-sided stems that can grow two to eight feet tall. Seed is spread by the movement of water and contaminated machinery, soil, livestock and hay. Tolerates hot or cold conditions and low to high nutrient levels in the water, but is intolerant of salt water. Overtops native species with dense bushy growth, is long-lived and produces millions of long-lived, highly viable seeds from an early age. Rapidly invades damp ground and shallow water. Showy, densely hairy flowerhead spikes (20-25 cm long, Dec-Feb) are made up of purple-magenta flowers with 5-6 petals which are followed by blackish seed capsules (3-5 mm long). Plant tall trees adjacent to infested margins to shade out weed. Narrow leaves (20-100 x 5-25 mm) are usually paired. Dec-Feb) are made up of purple-magenta flowers with 5-6 petals which are followed.
Much-branched stems are 4-8 sided, pink at base and die off in winter. Bouquet-violet Where is it originally from?Įrect, hairy, summer-green perennial herb (<1-2 m, occasionally <3 m) with a taproot and fibrous roots that form dense surface mats and produce up to 50 stems per rootstock.
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