Purpletop Vervain or Verbena Bonariensis is one of my favorite plants. I love its height and airy structure -great for weaving through other perennials. Too bad the photo here wasn't taken in the garden- it was taken in the Perennial Garden at the New York City Botanical Gardens. I did try it a few years ago planting three fairly large plants but they didn't return the following year. This stand of them at the Botanical Garden has reminded me to try it again perhaps in another spot.

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