Is Cirsium vulgare poisonous?
Bull thistle is a very dangerous plant. The sharp spines that cover virtually every surface of the stem, leaves and flower head can easily puncture and irritate skin.
Do globe thistles spread?
You can find globe thistle’s popularity rapidly spreading in southern California’s drought-tolerant garden scene! Easy to care for and enjoyable, this round-flowered perennial is a great addition to your yard. Give them a globe thistle and watch them get a green thumb in no time!
Is creeping thistle a perennial?
Creeping thistle is a perennial, British native that is visited by a wide range of insects. However it can quickly spread in grassland areas and borders. Once established, it can be difficult to eradicate permanently.
How can you tell Cirsium vulgare?
Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. This plant is much different than Canada thistle. The foliage of bull thistle has stiff hairs on top and a woolly appearance on the bottom; while Canada thistle is smooth on top and either smooth or hairy on the underside.
Do rabbits eat globe thistle?
Globe Thistle (Echinops ritro) is not really a thistle, but its spiney leaves and blue flower heads will deter rabbits just as well.
Do you cut back thistles?
Pruning and caring for thistle Being a very easy plant to care for, thistle requires practically no care at all. Cut wilting flowers off as they die and cut the plant back very short in fall. During the summer season, it’s important to water in case strong of extended drought.
What is purple thistle good for?
Beyond its use as a water source, thistle is well known for its ability to treat swelling of joints and tendons. I was pretty impressed by reading a paper by the American Herbalists Guild that describes its use for joint issues, such as rheumatoid arthritis, especially in children.
How fast does thistle grow?
The lateral roots can grow as much as 12 feet in a year and new plants can also regenerate from root fragments. Most clones are either female or male, both of which flower from midsummer to early fall.
Are thistles easy to grow?
Like cardoons, they grow very easily from seed, although side shoots are a more reliable means of producing vigorous, healthy new plants. For the first year you should cut off any flower heads as soon as they appear, to allow the plant to build up strength.
What kind of plant has Cirsium in its name?
A great many native North American plants have weed in their common names, despite their beneficial qualities, such as Asclepias tuberosa, commonly known as butterflyweed. Some other common species are: Cirsium lanceolatum, Cirsium palustre, Cirsium oleraceum.
Where are the disc flowers on a Cirsium plant?
The radially symmetrical disc flowers are at the end of the branches and are visited by many kinds of insects, featuring a generalised pollination syndrome. They have erect stems and prickly leaves, with a characteristic enlarged base of the flower which is commonly spiny.
Where does the name Cirsium oleraceum come from?
Cirsium oleraceum is cultivated as a food source in Japan and India . The word ‘Cirsium’ derives from the Greek word kirsos meaning ‘swollen vein’.
Why is Cirsium vulgare considered a noxious weed?
Most species are considered weeds, typically by agricultural interests. Cirsium vulgare (bull thistle, common thistle, or spear thistle) is listed as a noxious weed in nine US states. Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as butterflies.