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Best Crop of Thistles
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<blockquote data-quote="Agrivator" data-source="post: 8181975" data-attributes="member: 461"><p>I think the OP has an infestation of burr thistle (sometimes known as Scotch thistle). They are biennials and only spread by seeding. I suspect that seeds mixtures often contain them, even though seeds-men will dispute that.</p><p></p><p>They are completely different from creeping thistles which are perennials, Creeping thistles spread by underground roots and hardly ever spread by seeds. Most of the seeds are sterile, which is good job because otherwise the whole country would be covered in them.</p><p></p><p>Burr thistles are easy to kill. Wack them off at ground level with a no. 6 golf club, or spray with a clover safe herbicide. But do it when they are in the vegetative stage and before they are coming into flower, because even dying or wilted burr thistles with flower heads will produce viable seeds. In fact, they seem to have an ability to accelerate the formation of seed heads and thistle down if they a prematurely killed. </p><p></p><p>Is it still advised to wait until evening before spraying where you want to preserve clover - when the clover leaves have turned inwards and catch less spray. Or have I spent too much time in the sun?</p></blockquote><p></p>
[QUOTE="Agrivator, post: 8181975, member: 461"] I think the OP has an infestation of burr thistle (sometimes known as Scotch thistle). They are biennials and only spread by seeding. I suspect that seeds mixtures often contain them, even though seeds-men will dispute that. They are completely different from creeping thistles which are perennials, Creeping thistles spread by underground roots and hardly ever spread by seeds. Most of the seeds are sterile, which is good job because otherwise the whole country would be covered in them. Burr thistles are easy to kill. Wack them off at ground level with a no. 6 golf club, or spray with a clover safe herbicide. But do it when they are in the vegetative stage and before they are coming into flower, because even dying or wilted burr thistles with flower heads will produce viable seeds. In fact, they seem to have an ability to accelerate the formation of seed heads and thistle down if they a prematurely killed. Is it still advised to wait until evening before spraying where you want to preserve clover - when the clover leaves have turned inwards and catch less spray. Or have I spent too much time in the sun? [/QUOTE]
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Best Crop of Thistles
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