Thoroughwort: Understanding the Eupatorium Genus
If you’ve stumbled across the name thoroughwort in your gardening research, you’ve encountered one of the more complex plant groups in native gardening. Thoroughwort refers to plants in the Eupatorium genus, a diverse group of perennial herbs that has kept botanists busy with reclassification efforts for decades!
What Exactly is Thoroughwort?
Thoroughwort plants are perennial forb herbs – essentially, they’re non-woody plants that come back year after year. Think of them as the sturdy, reliable neighbors of the plant world. They lack significant woody tissue above ground, but don’t let that fool you into thinking they’re delicate. These plants have developed clever strategies for surviving winters by keeping their growing points at or below ground level.
The Name Game Challenge
Here’s where things get interesting (and a bit complicated): Eupatorium as a genus has undergone major botanical reshuffling. Many plants once called Eupatorium have been moved to other genera like Eutrochium and Conoclinium. This means when you see Eupatorium or thoroughwort, you’ll want to dig deeper to find out exactly which species you’re dealing with.
Where Does Thoroughwort Grow?
The Eupatorium genus has a remarkably wide distribution across North America. You can find various species from coast to coast, including:
- Most U.S. states from Maine to Florida and west to Texas
- Canadian provinces including British Columbia, Ontario, and Quebec
- Some species have also established in Puerto Rico and the U.S. Virgin Islands
Native Status: It’s Complicated
The native status of Eupatorium species varies significantly by location and specific species. While many species are native to various parts of North America, some have become established outside their original ranges. This is why it’s crucial to identify the exact species you’re considering and research its native status in your specific region.
Should You Grow Thoroughwort?
This is where the plot thickens! Without knowing the specific species, it’s challenging to give definitive growing advice. Here’s what we do know:
- These are generally hardy perennials that can adapt to various conditions
- As forb herbs, they typically don’t require the same care as woody plants
- Many species in this group are valuable for wildlife, though specific benefits vary by species
The Bottom Line for Gardeners
If you’re interested in growing thoroughwort, your first step should be identifying the exact species available in your area. Visit local native plant societies, extension offices, or reputable native plant nurseries to get species-specific information. They can help you determine:
- Which species are native to your region
- Specific growing requirements and care needs
- Expected size, appearance, and bloom time
- Wildlife benefits for your local ecosystem
Remember, the world of native plants is wonderfully complex, and thoroughwort is a perfect example of why species-level identification matters. Take the time to get to know the specific plants you’re adding to your garden – both you and your local wildlife will benefit from this thoughtful approach!
