Spreading Bluegrass: A Northern Grass Worth Considering
If you’re gardening in the cooler regions of North America and looking for a hardy perennial grass, you might have come across spreading bluegrass (Poa pratensis irrigata). This resilient graminoid has quietly established itself across several northern territories, from Alaska to Newfoundland, making it a grass that’s adapted to some pretty challenging climates.
What Exactly Is Spreading Bluegrass?
Spreading bluegrass is a perennial grass that belongs to the broader bluegrass family. While it shares the Poa pratensis name with the more familiar Kentucky bluegrass, this particular variety (irrigata) has its own unique characteristics. You might also see it listed under several scientific synonyms in botanical references, but don’t let that confuse you – it’s all the same hardy northern grass.
Where Does It Grow?
This grass has made itself at home across a impressive swath of northern North America. You’ll find spreading bluegrass growing in:
- Alberta and British Columbia
- Alaska
- Ontario and Quebec
- Labrador and Newfoundland
Interestingly, while it’s considered non-native in Alaska and Greenland, its status in Canada is less clearly defined. This suggests it may have a complex relationship with the northern landscape – perhaps naturalized in some areas while being truly native in others.
- Species observed
- No observations
Should You Plant It in Your Garden?
Here’s where things get a bit nuanced. Spreading bluegrass isn’t native to all areas where it now grows, but it’s also not flagged as invasive or noxious. This puts it in that middle ground where it’s not necessarily harmful, but it’s not necessarily the most ecologically beneficial choice either.
The honest truth is that we don’t have complete information about this grass’s wildlife benefits, invasive potential, or specific growing requirements. What we do know is that it’s a perennial grass that’s proven it can handle tough northern conditions.
Consider Native Alternatives First
Before jumping into planting spreading bluegrass, consider exploring native grass options for your area. Native grasses typically:
- Support local wildlife and pollinators better
- Require less maintenance once established
- Are naturally adapted to your local soil and climate
- Help preserve regional biodiversity
Check with your local native plant society or extension office to learn about indigenous grasses that might serve your landscaping needs.
If You Do Choose to Plant It
Unfortunately, specific growing information for Poa pratensis irrigata is limited in available resources. However, based on its northern distribution and perennial nature, it likely prefers:
- Cool, moist conditions
- Well-draining soil
- Full sun to partial shade
- Hardy conditions that can handle frost and snow
Given its presence across such a wide northern range, it’s probably quite cold-hardy, potentially suitable for USDA zones 2-6, though this should be verified with local experts.
The Bottom Line
Spreading bluegrass represents one of those middle-ground plants that isn’t necessarily bad but might not be the best choice for ecologically-minded gardeners. If you’re set on using it, it’s probably fine for non-conservation landscapes. However, you might find greater satisfaction – and provide more environmental benefit – by choosing a native grass species instead.
Before making your final decision, consult with local gardening experts who can provide specific advice for your area and help you identify the best native alternatives for your particular gardening goals.