At this stage it is impossible to tell which Carduus it is floral anatomy is likely needed for that. I have not read anything about being able to eat Carduus species leaves, so please do check on that before you prepare them as food. You can see they are more upright than your specimen.
This may not be the species you have, but the anatomy of the rosette is closer. Both Cirsium and Carduus genera have many invasive species, so you probably want to destroy the seed heads before they go to seed if you decide to keep it around for the pollinators which do enjoy the flowers.
Try high-concentration acetic acid very strong vinegar. Research shows it works! There are a number of commercially available products that are probably registered as herbicides in your state.
Ask at garden centers. It's acceptable for organic growers. The vinegar dissipates quickly and won't alter soil pH, so you can plant directly into the sprayed areas though it'd probably be a good idea to put down a layer of black plastic or cardboard and grow squash or melons there this season; give it a whole growing season to prevent last year's seeds from germinating.
It seems to be a thistle, but I am inclined to believe it is a biennial type like musk, bull, Scotch or tall thistle, rather than Canada thistle. Thistles can be difficult to identify without a stalk and flowers. The leaves in the photo seem to be hairy, with fairly uniformly-lobed margins. In contrast, Canada thistle leaves are smooth on the topside key characteristic , with irregularly-lobed margins.
Canada thistle is a creeping perennial, typically found in patches. As a perennial, it is difficult to eradicate because pieces of roots often survive. Biennial thistles have a first year rosette stage similar to the photo , and produce a flowering stalk in year two. For biennial thistles if there aren't too many plants , you can eradicate them by chipping out the crown of the rosette with a spade before they bolt and flower. The only way to successfully remove this WEED from your yard that I have found is to manually dig it up, root and all.
I dont believe in spraying chemicals. Roseann Sorrentino commented, I agree, I dont spray chemicals. Though it can be a pernicious weed, eating the weeds can be a great way to deal with them while retaining natural biodiversity in your garden. A plant found in upland pastures in the north of the UK, it is common to see it in hay meadows, open woodlands and along streams and woodland verges. It could be another thistle to include in your garden. It takes its name from the idea that it can cure melancholia.
Unlike other thistles, it does not have prickles. Its leaves have a dense white felt underneath and it has single purple, thistle-like flowers. This is the most common thistle species in the UK and is frequently found on disturbed and cultivated ground.
It spreads very quickly and is often considered a weed. But like the other thistles mentioned, it has great benefit to wildlife. Its seeds are an important food source for garden and farmland birds. Like other thistles, these too have historically been viewed as a human food source. The meadow thistle is an herbaceous perennial that is small and slender, without large spines on its leaves.
It is a short thistle, up to around 80cm in height, with single pinky-purple flowers. And is commonly found on damp meadows and grassland. It could find a place in a similar habitat in your garden if you are in Southern England, South Wales or Northern Ireland.
The marsh thistle or European swamp thistle is a tall thistle which produces a lot of nectar for a wide variety of pollinators. It thrives in damp ground such as wet fields, marshes or stream banks. Typically the multiple flowers of this plant are purple though white flowers are sometimes also found. This is one somewhat more scarce species of thistle that is found mainly in Southern England.
It prefers chalk or limestone grasslands and will do well in these conditions in a southern garden. The woolly flower heads of this type of thistle are unmistakable. The slender thistle, also known as the seaside thistle, occurs naturally occasionally in the UK, mainly in coastal regions.
It occurs very infrequently inland. It is quite tall, and bears small pinking flower heads in compact clusters of 3 or more. This is a thistle for coastal gardens with free-draining soil.
A similar and more widespread species is Carduus crispus, the welted thistle, which is found in several areas of the UK, south of Edinburgh. The musk thistle is found throughout the UK but is most common in England and Wales. It is a common species of chalky soils and so could be a useful garden plant if you have this soil type where you live.
It is common to see this plant on roadside verges or rough grassland, and it could be a good choice for a wilder, less tended part of your garden. The Carline thistle produces distinctive brown-and-golden flower heads that resemble a seeded thistle. This spiny biennial plant thrives on dry, chalk grassland in England and Wales. They create interest over a long period, the flower heads look like a thistle that has gone to seed, but they are actually in full flower.
And the dead heads then persist, often through winter to the following spring. Common knapweed is frequently found on all sorts of grasslands around the UK. It has thistle-like purple flower heads and like the true thistles described above, attracts a wide range of wildlife including many native butterfly species including common blues, marbled whites and meadow browns.
It can be a great flowering plant to naturalise in your lawn. Scotch thistle can grow to a height of from 3 to 9 feet. It is also known as Onopordum acanthium and can be either and annual or a biennial plant. The leaves are long and large up to 18 inches in length , and they are bluish-grayish green in color and covered with fine hairs.
As with other thistles, the tips of the leaves have spines. Globe-like, reddish-purple flowers appear in May through June. Distaff thistle or Carthamus lanatus, an annual thistle, can reach a height of from 2 to 4 feet.
Flowers of the distaff thistle are oblong, yellow in color, and flowering occurs from May through June. It has blade-like leaves with wool-like hairs and spiny tips. Cirsium arvense, or Canada thistle, is a perennial that can spread rapidly through its horizontal roots and by seeding.
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