The Russian thistle, however, only relies on temperature, needing a day temperature of about 20°C and 5°C at night to sprout. These plants will grow in environments with extremely little moisture and ...

One of the best plants you can grow for this purpose is a native thistle plant. According to the U.S. Forest Service, 58 varieties of thistle are native to North America. Cobwebby thistle (Cirsium ...

The Sacramento Mountains thistle is a rare purple flower than can grow to be six feet tall and lives only in wet, high-elevation habitats in the Sacramento Mountains near the town of Cloudcroft, New ...

Like many other biennial invasives, bull thistle is able to produce a large seed bank that can remain viable for up to 10 years! As a result, the plant can easily spread and form dense stands in ...

As sow thistle can grow up to 1 m tall, it can be quite a competitive weed ... The lobes in each leaf of prickly sow thistle do not tend to cut in so close to the midrib of the plant as in sow thistle ...