American Waterawlwort: The Tiny Arctic Aquatic You Probably Can’t Grow
Meet American waterawlwort (Subularia aquatica var. americana), one of North America’s most specialized and elusive native plants. This tiny aquatic annual might be native to vast swaths of the continent, but don’t get any ideas about adding it to your backyard water garden – this little guy has some very particular demands that make it nearly impossible to cultivate.
What Exactly Is American Waterawlwort?
American waterawlwort is a small annual forb that belongs to the mustard family. Despite its wide distribution, most gardeners will never encounter this plant in the wild, let alone in cultivation. It’s what botanists call a specialized aquatic, meaning it has evolved to thrive in very specific water conditions that are hard to replicate outside of its natural habitat.
This diminutive plant produces tiny clusters of small white flowers and grows as a rosette of narrow, awl-shaped leaves – hence the awlwort part of its name. The entire plant rarely exceeds a few inches in height, making it easy to overlook even when you’re standing right next to it.
Where Does It Call Home?
Here’s where things get interesting – American waterawlwort has an impressively wide native range spanning from Alaska and northern Canada all the way down to scattered locations in the western and northeastern United States. You can find it in British Columbia, Alaska, Manitoba, New Brunswick, California, Nova Scotia, Ontario, Colorado, Quebec, Saskatchewan, Yukon, Northwest Territories, Nunavut, Idaho, Maine, Michigan, Minnesota, Nevada, New Hampshire, New York, Oregon, Utah, Vermont, Washington, Wyoming, Labrador, and Newfoundland.
- Species observed
- No observations
Despite this extensive range, the plant is quite rare and localized within these areas, typically found in alpine lakes, arctic ponds, and other cold, pristine water bodies.
Why You Probably Shouldn’t Try to Grow It
Before you get excited about adding this native plant to your collection, let’s talk reality. American waterawlwort is what we call a look but don’t touch native species. Here’s why:
- Extreme cold requirements: This plant thrives in USDA hardiness zones 1-6, preferring frigid conditions that most gardens simply can’t provide
- Ultra-specific water needs: It requires pristine, cold, oligotrophic (nutrient-poor) water – not your typical garden pond conditions
- Specialized substrate: The plant grows in rocky or sandy lake bottoms, often at depths that fluctuate seasonally
- Annual lifecycle: Even if you could meet its needs, you’d need fresh seeds each year
Its Role in Natural Ecosystems
While American waterawlwort might not be garden-worthy, it plays an important ecological role in its native alpine and arctic habitats. The plant helps stabilize lake and pond sediments and provides food for waterfowl and other aquatic wildlife, though its small size means its contribution is modest compared to larger aquatic plants.
Better Alternatives for Water Gardens
If you’re inspired by the idea of growing native aquatic plants but live outside the arctic, consider these more garden-friendly alternatives:
- Wild rice (Zizania species): For larger water features in appropriate climates
- Arrowhead (Sagittaria species): Beautiful emergent plants with distinctive leaves
- Water lilies (Nymphaea species): Native varieties for ornamental ponds
- Pickerel rush (Pontederia cordata): Lovely purple spikes for pond edges
Spotting It in the Wild
If you’re lucky enough to be hiking in alpine areas within its range, keep an eye out for American waterawlwort in shallow areas of clear, cold lakes and ponds. Look for small rosettes of narrow leaves barely poking above the water surface, often growing alongside other specialized alpine aquatics.
Remember, this plant is quite rare even within its native range, so if you do spot it, take only photos and leave only footprints. Its specialized habitat requirements make it vulnerable to disturbance and climate change.
The Bottom Line
American waterawlwort is a fascinating example of plant specialization and adaptation to extreme environments. While it’s not destined for your garden pond, appreciating plants like this helps us understand the incredible diversity of native flora and the importance of preserving the specialized habitats they call home. Sometimes the best way to support native plants is simply to protect the wild spaces where they naturally thrive.