Doug Tallamy

Scientific

The empirical core of Tallamy’s research: caterpillars (Lepidoptera larvae) are the keystone food source for breeding songbirds. A single chickadee clutch requires 6,000–9,000 caterpillars during the 16-day nesting period. Native trees and shrubs host roughly 35× more caterpillar species than non-native ornamentals; oaks alone host more than 500 caterpillar species in the eastern U.S. The implication: planting non-native ornamentals (Bradford pear, butterfly bush, burning bush, ginkgo) creates yards that look green but cannot feed bird-rearing-bird-rearing-insectivore food webs.

The “keystone plants” framework: a small number of native plant genera (oaks, willows, cherries, goldenrods, sunflowers, asters) host disproportionate shares of regional caterpillar diversity. Targeting plantings to keystone genera produces outsized food-web benefit per planted area.

The Homegrown National Park goal: convert half of U.S. residential lawn area (~20 million acres) to native plantings. The math: this would constitute a contiguous-equivalent wildlife habitat larger than every National Park combined.

Practical

Tallamy’s recommendations for a homeowner converting yard to habitat:

• Reduce lawn area to functional minimum (paths, gathering areas).
• Plant native trees from keystone genera — start with oaks if your region supports them.
• Layer: canopy trees, understory trees, shrub layer, herbaceous layer.
• Use native ground covers and meadow plantings instead of turf.
• Manage invasive species removal.
• Reduce or eliminate insecticide use (especially neonicotinoids, which are systemic).
• Reduce night lighting (artificial light at night is a documented insect-population stressor).
• Use Homegrown National Park’s regional native-plant tools to find species and nurseries.

Cultural

Tallamy’s books occupy a specific cultural niche: they’re written for the suburban homeowner who already wants to do something for nature but doesn’t know what. The advice is concrete, the expectation is cumulative-tiny-actions-at-millions-of-locations, and the empirical underpinning is real research published in peer-reviewed journals (much of it by Tallamy and his graduate students). The Homegrown National Park map — a citizen-science database of lots people have converted — has registered tens of thousands of properties.

Lenses still to grow

• The keystone-plant database and how it varies by ecoregion
• Specific Tallamy graduate-student research papers
• The Homegrown National Park map data and its growth curve
• The interaction with native-plant nurseries and the supply problem

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

• Enables: [[pollinator-decline]]
• Shares approach with: [[robin-wall-kimmerer]]
• Member of: [[person]]
• Pioneer of: [[homegrown-national-park]]
• Opposes: [[lawn-monoculture]]
• Enabled by: [[good-host-plants]] · [[native-plant-nursery]]

Sources

• Tallamy, Bringing Nature Home: How You Can Sustain Wildlife with Native Plants (2007)
• Tallamy, Nature’s Best Hope: A New Approach to Conservation that Starts in Your Yard (2020)
• Tallamy, The Nature of Oaks (2021)
• Homegrown National Park (homegrownnationalpark.org)
• Tallamy peer-reviewed publications, University of [[harrington-delaware|Delaware]] Entomology

Rooted in life.