NEW ORLEANS (AP) — It is Carnival season in New Orleans. That means gazillions of green, gold and purple Mardi Gras beads.

Once made of glass and cherished by parade spectators who were lucky enough to catch them, today cheap plastic beaded necklaces from overseas are tossed from floats by the handful. Spectators sometimes pile dozens around their necks, but many are trashed or left on the ground. A few years ago after heavy flooding, the city found more than 46 tons of them clogging its storm drains.

The beads are increasingly viewed as a problem, but a Mardi Gras without beads also seems unfathomable. That is why it was a radical step when the Krewe of Freret made the decision last year to ban plastic beads from their parade.

“Our riders loved it because the spectators don’t value this anymore,” Freret co-founder Greg Rhoades said. “It’s become so prolific that they dodge out of the way when they see cheap plastic beads coming at them.”

This year, beads are back, but not the cheap plastic ones. Freret is one of three krewes throwing biodegradable beads developed at Louisiana State University.

The “PlantMe Beads” are 3D-printed from a starch-based, commercially available material called polylactic acid, or PLA, graduate student Alexis Strain said. The individual beads are large hollow spheres containing okra seeds. That is because the necklaces can actually be planted, and the okra attracts bacteria that help them decompose.

Kristi Trail, executive director of the Pontchartrain Conservancy, said plastic beads are a twofold problem. First, they clog the storm drains, leading to flooding. Then those that aren’t caught in the drains are washed directly into Lake Pontchartrain, where they can harm marine life. The group is currently preparing to study microplastics in the lake.

The trend toward a more sustainable Mardi Gras has been growing for years and includes a small but growing variety of more thoughtful throws like food, soaps and sunglasses. Trail said there is no good data right now to say if those efforts are having an impact, but the group recently got a grant that should help them answer the question in the future.