A tricky plant to take care of, the Knautia plant is still worth growing for. With its tall stems, they can creep into other areas of your garden but with the right information on how to grow them, you won't be having a hard time. What's good with Knautia is that they are long-blooming plants which begins in summer, and will provide you with pink blooms that can go into deep-red in color which resembles like a pincushion. They're also flexible enough to tolerate a variety of growing conditions, which is one reason why gardeners love to grow them around.

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Source: The Spruce