If you get an unsolicited package of seeds in the mail, don’t open it — those seeds could belong to an invasive species. A handful of California counties reported to the U.S. Department of Agriculture ...

If you receive unsolicited packages of seeds from a foreign country in the mail, don’t plant them, San Luis Obispo County officials said.

The US authorities are warning against planting mysterious seeds that have been arriving ... which “appear to have mostly originated from China”, The Wall Street Journal reports.