By far, this is becoming one of my favorite plants in the garden. Pictured here is Liatris spicata "Kobold", also known as Blazing Star or Gayfeather, that I have growing behind my coneflowers. These purple spikes add a different texture to the garden and are great for the back of the border (at least those where max height is around 4 feet). The flower spike reaches anywhere from 2-3 feet tall, and forms a clump of bulbs, but some of my spikes this year are pushing 4 feet tall..
Looks like I will have to divide mine next spring as some of the original single bulbs I planted two years ago have 6-8 spikes. Butterflies love this native wildflower!