I spotted the tall white flower heads in a damp ditch by the back road. The spot sat a good half mile from my zone 5 garden. That was the only valerian I had planted for miles. No one sowed it out there. It had walked itself out the gate and down the road. I pulled a few stray seedlings from that ditch and brought them home to check the roots. That one roadside clump tells the real valerian origin story. The plant does not come from a single country at all. If you grow it, you may meet the same surprise in your own yard.
Valerian is native to Europe and Asia. It is not from one nation you can point to on a map. Its wild range runs from the British Isles, across Europe, and into the cool parts of west Asia. People have grown it as a herb for many centuries. From those old gardens it spread far past its home soil. That is how it reached North America.
The plant you mean is the common garden herb, Valeriana officinalis. Settlers and herb growers carried it to the United States and Canada. It did not stay put for them. The species slipped out of the garden on its own. Then it took to the wild. That escape act is the part that may catch you off guard if you are a new grower. You plant one tidy clump, and a few seasons later you find it down the lane.
It found the cool northern states much to its taste. Valerian loves cool weather and steady rain. So the damp, mild north suits it far better than the hot, dry south. The roots send out rhizomes that creep sideways. Each one can form a fresh crown a foot or two from the parent. The flowers also drop loads of light seed that wind and water carry off. Both habits let it move fast once it gets a foothold near you. If your land is cool and wet, you should plan for that spread from the start.
Do you want to know where valerian grows wild today? Look to the northern US and southern Canada. You will find it in old fields, by streams, and in damp roadside ditches like mine. It also still grows wild back on its home turf in Europe and west Asia. The plant just follows the water and the cool air. It lands wherever those two things meet, near you or far off.
Here is a point worth a clear note for you. The garden valerian is the newcomer in North America. It is not a native plant here. But the continent does have its own kin you should know about. One is the marsh valerian, and its formal name is Valeriana uliginosa. That one is a true native of North America. It is also imperiled, and the state of Maine lists it that way. So the wild plant most people meet is the import from abroad. The rarer native cousin hangs on in just a few wet, guarded spots. You are far more likely to bump into the European kind in your travels.
Knowing the Valeriana officinalis native range sits in Europe and Asia should shape how you treat it. A plant that crossed an ocean and spread on its own is one to watch. In cool, wet regions it can turn weedy and crowd out your other plants. So check your local invasive-plant rules before you set any in the ground. Pick a spot you can watch with ease. Pull the stray seedlings while they are young. Do that and you get the herb you want, with none of the roadside surprise I found. Treat this plant with care and respect for valerian origin abroad, and it stays a good guest in your beds.
Read the full article: Valerian Plant: Grow, Identify, and Use It
