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Canada thistle (Cirsium arvense) (L.) Scop. One musk thistle plant alone can, for … Canada thistle seedlings develop a perennial habit (the ability to reproduce from their root systems) about seven to eight weeks after germination. In May, new shoots bolt. Canada thistle (aka creeping thistle) is a determined weed if ever there was one. Sure, it has attractive purple blooms, but don’t be fooled. Reproduction: Canada thistle spreads quickly through horizontal roots; Each individual plant can produce 1000 to 1500 seeds. It is a non-native invasive species from Europe, and landowners with Canada thistle on their property are obligated to take measures to control it. It is unwanted due to some thistles' aggressive reproduction ability. An aggressive spreader with spear-like foliage topped with pointy, barb-like hairs, this invader does its very best to intimidate. March through April, Canada thistle seeds germinate and grow to form rosettes. The flower heads can prolifically produce seeds for dissemination far and wide, including by wind pollination. The thistle is disliked by many and branded a weed. Canada thistle inhabits agricultural land and other disturbed locations. According to some taxonomists, four varieties or biotypes exist that differ in growth habit, leaf characteristics, seed germination, and development. Canada thistle spreads both by seeds and by budding from underground roots. Canada thistle leaves are lance-shaped with irregular lobes and sharp prickly margins. Canada thistle is a state-listed noxious weed in California and many other states. Legal status: Canada thistle is considered a noxious weed in 46 states including Indiana. New plants can develop from underground shoots and roots longer than 1 cm. Plants produce deep creeping roots with buds that give rise to new shoots. Canada Thistle and its Control . Since Canada thistle allocates most of its reproductive energy into vegetative reproduction, this feature can be manipulated to the land manager’s advantage. Canada thistle can reproduce by seed and has male and female flowers on separate plants. Canada thistle invades natural areas such as prairies, savannas, open areas in forests, and dunes if some degree of disturbance already exists. Growth habit: Deep-rooted and colony-forming perennial. Small localized infestations occurring in Reproduction and spread. Seeds will look like white tufts and rante from 2-4mm long. A high priority in Canada thistle management is to focus on early detection and taking immediate measures to prevent establishment. It stores food energy in its extensive root system both to survive the winter and to fuel the plant's reproductive drive the following season. Canada thistle (Cirsium arvense), is a spreading perennial weed of crops, pastures, and disturbed sites.It is most troublesome in perennial crops, rangeland, and areas where reduced tillage is practiced. Life Cycle. Because of its aggressive nature, it can also invade lawns and gardens. Canada thistle (Cirsium arvense) is a persistent perennial weed that causes significant crop yield losses.It reproduces through both seed and root regeneration, but the latter is the most successful. Canada thistle is difficult to control because of its reproductive strategies—a perennial plant which reproduces by both seed and vegetative growth. It also invades wet areas with fluctuating water levels such as streambanks, sedge meadows, and wet prairies. Canada thistle begins to flower in late spring to early summer in response to 14- to … Reproduction occurs by windblown seeds and creeping rhizomes. Flowers can be white or purple, blooming in June to August. 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