Drive a rural two-lane highway in North Florida this fall and the grassy shoulder might be doing more ecological work than the forest behind it. Crews have hand-planted 15,000 native milkweed plants along the state's roadsides, and monarch butterflies are already using them to feed and breed.

  • 15,000 native milkweeds planted along North Florida roadsides
  • 10,200 acres of state right-of-way now managed for pollinator habitat
  • 98% germination rate on the latest batch of nursery-grown seed
  • Project funded through 2029, with 6,000 more plants still to go in the ground

Why roadsides, of all places

The planting is a partnership between the Florida Museum of Natural History and the Florida Department of Transportation, launched under a statewide agreement to manage roadside land for monarch conservation. FDOT had already committed to overseeing 10,200 acres of rights-of-way for the effort — land that exists regardless of what grows on it.

"We don't have enough conservation lands to maintain pollinator populations through time in many areas, so we have to look to environments that we, as humans, manage every day," said Jaret Daniels, curator of Lepidoptera at the Florida Museum of Natural History. "Roadsides are managed regardless, so why not do so in a way that confers greater benefits?"

Milkweed is the only plant monarch caterpillars can eat, which makes it the bottleneck for the species' survival. Adult monarchs also travel more than 100 miles in a single day during migration, so a chain of roadside nectar stops functions like a chain of gas stations for an insect that never gets to refuel at home.

Building a milkweed supply chain from scratch

Daniels' team focused on two native species suited to Florida's poor, sandy roadside soils: pinewoods milkweed and butterfly weed. Pinewoods milkweed isn't sold commercially because its deep taproot requires special elongated pots, so researchers built their own pipeline — hand-collecting seed pods in the field, bagging them to stop the wind from carrying off the seeds, then growing them out at the University of Florida's Native Plant Nursery.

"It's been a lot of work but also really exciting to see. We've had good success with plant establishment, and we've seen monarchs using the plants already in the field."

That quote from Daniels captures the payoff of a six-year experiment that started with careful site selection — mapping where native milkweed already grew, then filling in the gaps. The team plants during winter dormancy, sparing both the workers and the seedlings Florida's brutal summer heat.

A test case for the rest of the country

Florida is currently the proving ground for a model that the University of Illinois Chicago-led initiative hopes to expand nationally: turning the vacant land beside highways, power lines and railways into pollinator corridors. Birds and other predators benefit from the insect activity too, and farms growing blueberries and watermelons nearby get a boost from wild pollination.

It will be a few years before Daniels' team has full data on which conditions work best. But the early signs — monarchs already feeding at nearly every stage of the rollout — suggest that some of the most overlooked strips of American land might also be some of the easiest to fix.