Alluring, like sirens, some vicious weeds produce beautiful flowers in calming purple hues. Here are the problematic blossoms ...

Now that the weather is cooling, you might notice that some of the plants we encounter look nothing like their mid-summer ...

This variety blooms in September and October with dark-purple, daisy-like flowers that can almost completely cover the two-foot-tall mounds. The flowers are also a good source of late-season ...