The Small Farm Canada team attended the 2026 Cereals Show at Jeremy Clarkson's Diddly Squat farm in early June. We came across one crop that we had never heard of, that is apparently native to North America, that could be interesting to Canadian farmers who are searching for crops that can improve soil health, support pollinators and contribute to climate solutions. The plant is silphium, also known as cup plant (Silphium perfoliatum).
Native to parts of North America, including Ontario, silphium is a long-lived perennial capable of producing biomass for up to 20 years without replanting, making it appealing in low-input systems.
While still largely unfamiliar to Canadian producers, the crop is being studied in Europe and North America for its combined environmental and economic benefits, including forage potential, biogas production and ecological services.
Can silphium grow in Canada?
Early evidence suggests that silphium could indeed fit within many Canadian growing regions.
The crop is native to Ontario and Quebec and hardy to Zone 3 or 4, meaning it can withstand cold winters across much of southern and parts of central Canada, as well as British Columbia, but would like not do well in Northern areas, and some areas of Atlantic Canada.
It thrives in temperate climates, tolerates frost and can handle both drought and short-term flooding once established, which adds resilience under variable weather patterns.
For small farmers, especially those managing marginal land or looking to diversify, this adaptability is significant. Silphium prefers full sun and well-drained soils, but it can also perform in wetter conditions typical of low-lying fields or riparian zones.
However, establishment can be slow, and weed control in the first year is critical. Germination often requires cold stratification, which may complicate large-scale adoption without improved seed systems.
A biodiversity powerhouse
One of silphium’s most compelling advantages is its contribution to biodiversity.
The plant produces tall stems topped with bright yellow flowers that bloom from mid-summer into early fall, providing critical nectar during a period when other forage sources are limited.
It acts as a magnet for pollinators, including bees, butterflies and beneficial insects.
Research also shows that perennial crops like silphium support higher populations of overwintering insects and arthropods compared to annual crops such as corn, thanks to reduced soil disturbance and continuous habitat cover.
For small farms integrating ecological practices, adding silphium could help strengthen on-farm ecosystems while improving pollination services.
Carbon capture and soil benefits
Silphium’s environmental value extends below ground.
Its deep root system can reach more than two metres, helping the plant access nutrients, improve soil structure and reduce nutrient leaching.
These roots also contribute to soil carbon storage, an important factor in mitigating climate change.
Because silphium is perennial, it requires less annual tillage and fewer passes with machinery, lowering fossil fuel use and preserving soil carbon levels.
For Canadian producers interested in regenerative agriculture, these traits align with emerging carbon markets and sustainability programs.
Silphium offers flexibility that may appeal to small-scale and diversified operations: forage and biogas.
Forage potential
Studies indicate that silphium has moderate to good feed value, with crude protein levels comparable to some forage crops depending on harvest timing.
It can be ensiled and fed to livestock, although it may require blending with other feeds to balance fibre and nutritional content.
Biogas and biomass
More recently, attention has focused on its use as a feedstock for anaerobic digestion, producing renewable energy in the form of biogas.
While yields may not always match corn silage, silphium’s perennial nature and lower input costs can improve overall sustainability and reduce environmental impacts.
For farms exploring on-site energy systems or co-operative digesters, silphium could become part of a diversified biomass strategy.
Challenges still remain
Despite its promise, silphium is not a ready-made solution for Canadian agriculture.
Key challenges include:
- Limited commercial seed supply and inconsistent germination
- Slow establishment in year one
- Lack of region-specific fertility and management recommendations
- Uncertainty around long-term yields in Canadian climates - the gentlemen the Small Farm Canada team spoke to about silphium said most of his information came from German farmers who were growing it for biodigesters.
In Canada, there are discussions about whether silphium could behave aggressively outside its native range, although current evidence suggests the risk is low.
A crop worth watching for Canadian small farms
Silphium is unlikely to replace traditional crops in the near term. However, it represents a new category of multifunctional perennial crops that align with the priorities of many small farmers and homesteaders: resilience, biodiversity, and sustainability.
For Canadian producers managing mixed farms, marginal land or ecological initiatives, silphium may offer a practical way to:
- Support pollinators
- Build soil carbon
- Diversify forage systems
- Contribute to renewable energy production
With growing research and climate pressures reshaping agriculture, this tall prairie plant may soon find a place in Canadian fields.
If you want, I can also create a matching horizontal feature image (no text, Small Farm Canada style) or a sidebar box with “how to try silphium on your farm” practical steps.