2) Not many animals will eat it although goats and sheep will eat it at certain stages of the knapweed's development. It emerges in the spring to form spreading branches and produces light pink to lavender flowers which bloom from June to September. Spotted knapweed grows 12 to 60 inches tall, is more erect and has more limited branching than diffuse knapweed. “Many brands of weed killer help control knapweed. Mammalian herbivores normally shun this plant because of the bitter foliage; but they will eat it if little else is available, as occasionally occurs in overgrazed pastures. Cattle prefer grasses over spotted knapweed. The striking pink display of spotted knapweed, Centaurea stoebe ssp. The toxic dose of green Russian knapweed is 1.8-2.6 kg/100 kg. This is where more is not better. It seems that thinner weeds, like spotted knapweed or diffuse knapweed are easier for them to learn how to eat. They usually graze them successfully the first day in pasture. Spotted & Diffuse Knapweed Species Centaurea biebersteinii & Centaurea diffusa. Dead spotted knapweed stems generally remain erect during the winter unless crushed by heavy snow-pack. 2-4 D, Curtain Crossbow, Milestone and Feeder are a few brands. It is not known how often stock and wildlife eat knapweed seed heads, but tests indicated that 11% of the seeds eaten by mule deer and 4% of the seeds eaten by sheep pass through their digestive systems, with a viability of up to 22%. This could be other plants, animals, insects or diseases. Spotted knapweed generates between 400 and 25,000 seeds per plant. The plant is native to Eurasia but was introduced to North America in the late 19th century. The affected animal cannot bite-off and chew its food in a coordinated manner. Bushier weeds or plants with spines, like thistles, take a bit longer. She turned to Robert Hanke, who prefers to take care of weeds with goats. body weight PER DAY eaten over a 28-35 day period. Sheep and goats will eat more knapweed, especially when combined with other management tactics. It changes the Ph … Some of the seeds of Spotted Knapweed can pass through the digestive tracts of livestock and remain viable; thus, these animals may help to distribute the seeds. Russian knapweed (Rhaponticum repens, previously referred to as Acroptilon repens) is a bushy rhizomatous, deep-rooted perennial. However, survey respondents indicated that under certain conditions sheep and goats will graze Russian knapweed, especially when the plants are young and after the animals have grazing experience. Mixing is important. Potential Effectiveness: Most of the literature indicates that livestock will not eat Russian knapweed because of its bitter taste. Another July has come and gone, but not all of the fireworks are over. micranthos, is still going strong in rangelands and old fields and along highways and railroad grades across the country. 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