Monoculture vs. Polyculture for Milkweed Farming - Ernst Seeds
May 14, 2024

Monoculture vs. Polyculture for Milkweed Farming


Polycultures, like natural ecosystems, are highly diverse. 

Dozens of distinct plant species exist next to one another and thrive through a balance of improved soil health, nutrient cycles, and water retention. This diversity provides a formidable shield against pests, disease, and even weather fluctuations.

Monocultures, on the other hand, are synonymous with modern industrial farming. In this arrangement, large areas are covered by a single crop species, and farmers gain strategic advantages through efficiency in harvesting and cultivation.

Although polycultures are more sustainable and environmentally friendly in the long run, that doesn’t necessarily mean that monocultures don’t have their purpose.

The key lies in the balanced and forward-thinking use of each to maximize commercial crop production and environmental sustainability.

Today, we’ll break down the distinction between mono and polycultures and use butterfly milkweed as an example for both.

Understanding Monoculture vs. Polyculture (Biodiversity)

The relationship between monoculture and polyculture can be viewed through their impacts on agricultural sustainability and environmental health.


  • Consists of a large area dominated by a single species.
  • They are less resilient to diseases and pest infestations because of the lack of biodiversity.
  • They are rare in nature. Monocultures are normally associated with modern industrial farming techniques, where they offer greater efficiency for crop production.
  • The absence of milkweed in monoculture disrupts ecological balance by depriving certain species, such as monarch butterflies, of vital habitat and food sources.


  • Involve the cultivation of multiple species within the same area, mimicking the diversity found in natural ecosystems.
  • Enhance soil health and fertility through the varied contributions of different species.
  • Can be more labor-intensive and require more knowledge to manage effectively.
  • Reduce the risk of meadow failure due to insect and disease pests or adverse weather conditions.

In short, where monocultures focus on optimizing the short-term yields of a single crop, polycultures prioritize long-term sustainability, ecosystem services, and resilience to environmental changes.

Monoculture vs Polyculture, and Milkweed

The North American monarch butterfly, an emblem of natural beauty and a key indicator of ecological health, has suffered an alarming decline over the past few decades.’

Habitat loss and environmental changes have decreased its population by over 80%.

Central to the monarch butterfly’s survival is the milkweed plant, the sole nursery for monarch larvae. One challenge with cultivating large milkweed fields is that they often don’t last beyond five growing seasons. Population declines of milkweed in monocultures are often due to insect or disease pests.

Farmers, gardeners, and anyone interested in the conservation of this iconic species may think that a monoculture of milkweed is the best home for larvae, but this study published in 2020 found some interesting results to the contrary.

Butterflies Prefer Biodiversity

The study presents compelling evidence that monarch butterflies are more likely to lay eggs in polyculture settings. 

A mix of swamp milkweed and other wildflower species was studied, and a 22% increase in monarch egg-laying was found compared to milkweed in monoculture plots.

In Spite of Increased Predator Presence

A notable concern with increasing plant diversity is the potential to attract a higher number of predators and parasitoids, which could threaten monarch larvae.

However, the study found that while mixed-species plantings did indeed host more predators, this did not translate into higher monarch mortality rates. 

This finding further reinforces the idea that a balanced ecosystem, even with natural enemy populations, does not necessarily endanger targeted conservation efforts.

Plant Diversity Benefits Extend Beyond Monarchs

While the primary focus was on monarch butterflies, the research also highlighted that polyculture settings supported a wider range of beneficial insects without compromising the success of monarch larvae.

Polyculture milkweed farming fosters a resilient habitat, bolstering monarch populations and contributing to the overall health of the environment.

Monocultures vs Polycultures for Farming and Conservation

For farmers and backyard conservationists interested in sustainability, the evidence heavily favors polycultures for butterfly milkweed cultivation.

A strategic selection of companion plants enhances monarch egg-laying and supports an ecosystem robust enough to maintain predator-prey balance. 

This approach can be a cornerstone in integrated pest management strategies, creating self-regulating habitats that are less reliant on chemical interventions.

Even Small Gardens Can Make a Difference

For hobbyists and gardeners, the study offers an encouraging perspective on the impact of backyard conservation efforts.

The findings highlight the value of diversity in small-scale gardens. Every milkweed plant in a diversified setting contributes to monarch conservation, providing a practical way to contribute to the broader mission of saving the monarch butterfly.

Practical Guidance: Selecting Plant Species

The cornerstone of effective polyculture milkweed farming lies in thoughtful plant selection.

Choose native wildflowers that thrive in your local climate and bloom at different times to ensure a continuous supply of nectar throughout the growing season.

To complement your milkweed, consider species like:

  • Asters (Aster species)
  • Purple Coneflower (Echinacea purpurea)
  • Sunflowers (Helianthus species)
  • Oxeye Sunflower (Heliopsis helianthoides)
  • Blazing Star (Liatris species)
  • Wild Bergamot (Monarda fistulosa)
  • Mountain Mints (Pycnanthemum species)
  • Goldenrods (Solidago species)

This variety supports monarchs and attracts a broad spectrum of pollinators and beneficial insects.

Get Your Milkweed Seeds from Ernst

The evidence suggests a harmonious blend of diverse flora, including butterfly milkweed, cultivates a resilient and nurturing environment that is pivotal for conservation and agriculture.

Ernst Conservation Seeds embraces polyculture milkweed farming and champions the preservation of native species and ecologies throughout eastern North America.

Our customers only received the highest-quality seeds available. We can do this thanks to our 60 years of experience growing and processing our products in ecologically sustainable ways.Questions for our plant experts? Get in touch with Ernst today and let us know what you need help with.

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