Mysterious packages of seeds have put ag experts in Iowa on high alert this summer.

Thousands of American households began receiving unsolicited seed packages from China last month. Recipients are urged not to plant or dispose of the seeds, as they could be invasive. Instead, they should contact the Iowa Department of Agriculture so the agency can collect, analyze and properly destroy the seeds.

"The Iowa Department of Agriculture is working closely with the USDA to trace, collect and properly destroy these unknown seeds to protect our agriculture community from plant and seed-borne disease...