Obedient Plant, False Dragonhead
Physostegia virginiana (L.) Benth. is the correct and accepted scientific name for this species of Physostegia. It was named and described as such by George Bentham in Labiatarum Genera et Species in 1834, It was first described as Dracocephalum virginianum by Carl Linnaeus in Species Plantarum in 1753.
The genus, Physostegia Benth., was named and described by George Bentham in Edward’s Botanical Register in 1829. Plants of the World Online currently lists 12 accepted species in the genus.
I bought my Physostegia virginiana (Obedient Plant) from one of the local garden clubs plant sale in the spring of 2016. This plant has been on my wishlist for many years so I was glad I found one at the plant sale. A lot of information online say this species can be somewhat invasive, but so far I haven’t had any problems with that. I put it where an invasion would be a good thing in a corner along the foundation of my grandparent’s old house.
This square stemmed perennial gets the name Obedient Plant by the way the individual flowers will temporarily stay where you put them. Flower spikes (inflorescences) can be around 10” long are arranged in four rows. Flowers can be white, pink and lavender shades and can have stripes or dots.
Origin: North America
Zones: USDA Zones 3a-10b (-40 to 35° F)
Size: 24-36” tall
Light: Sun to part shade
Soil: Well-drained soil
Notes: Plants can flop in rich soil, to much shade and hot temps.
On February 18 (2018), I pushed back the leaves in the corner of the foundation and this plant was growing under the leaves. We had a very cold January and I was surprised. I am not sure when they started coming up
I brushed back the leaves on March 9 and saw what had become of the single plant I put here in 2017.
By April 13 more had come up.
By June 3 the Physostegia virginiana was almost as tall as the foundation.
By the end of July the Physostegia virginiana was loaded with buds and the Rudbeckia fulgida var. sullivantii ‘Goldsturm’ was loaded with flowers.
On August 11 the Obedient Plant is blooming up a storm while the Rudbeckia is begging to fade. Some of the upper leaves of the Obedient Plant turn brown and I am not sure why. It almost appears they were burned. I don’t water this bed that often and I rarely get the leaves wet when I do (especially on top).
Hmmm… The flowers seem to be white but they look pinkish in this photo. I tried bending the flowers to see if they would stay in that position. They are called Obedient Plant because the flowers are supposed to stay in whatever position you put them in. Well, it didn’t work… Does that mean this isn’t a Physostegia virginiana after all? Hmmm…
The winter of 2018-2019 wasn’t near as cold as last year. We had a lot more snow but it never lasted long. I went to check to see what perennials were coming up on March 7 and the Physostegia virginiana were all alive and well. I wonder how many will be under the leaves when I remove them?
Some information says the plants can flop in rich soil, to much shade and hot temps. Other sites say they need rich, moist soil.
As I mentioned earlier, this plant can supposedly become invasive if it is growing where in favorable conditions. There are several cultivars, including one called ‘Miss Manners’ which behaves itself and doesn’t wander.
I will continue adding more photos and information as time goes by.
I hope you enjoyed this page and maybe found it useful. If you have any comments, questions or suggestions, I would like to hear from you. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant.