Forming in clumps, the Gas plant is a herbaceous perennial that produce a profusion of light purple-pink or white flowers at the top of its tall, erect stems during the late spring and summer. Its glossy, deep green foliage offers interest through much of the year, and they provide a pleasing aroma, too. Even the seed pods that form after the blooming period is over offers ornamental interest. This plant will look at home at the back of borders and bed and is a great fit in densely planted cottage gardens.

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Source: The Spruce