40-48" tall x 18-24" wide (cutting propagated). At last, a cold hardy, heat tolerant, xeric Bee Balm! 'Peter's Purple' is as beautiful as it is durable in the garden. A garden hybrid between Monarda bartlettii and Monarda fistulosa, this vigorous, heat lover blooms for months in summer with showy lavender-purple flowers. The deep green foliage is completely powdery mildew resistant, making it a "must have" hummingbird plant for all areas of the US.