You can buy one. The Firefly Petunia, sold by an Idaho company called Light Bio, looks like an ordinary white petunia in daylight and gives off a soft green glow after dark. It costs about $29, cleared USDA review, and the first run of 50,000 plants sold out.
The glow comes from a mushroom. Researchers borrowed genes from Neonothopanus nambi, a bioluminescent fungus, and the reason it works is a coincidence of chemistry. The mushroom's light reaction runs on caffeic acid, a compound ordinary plants already produce as part of the stiffening in their cell walls. The petunia had the fuel all along. It only needed the enzymes to burn it.
The result is continuous. The plant needs no special feeding and no charging, and the glow is brightest at new growth, so buds and fresh leaves light up before older foliage does.
A separate team at South China Agricultural University took the opposite approach. Rather than change the plant, they injected common succulents with phosphor particles, the same principle behind glow-in-the-dark paint. A few minutes under sunlight or an LED charges them, and they glow for up to two hours in blue, red, green, or violet. That work was published in the journal Matter.
The difference is where the light comes from. One plant makes its own and never stops. The other borrows yours and gives it back slowly. The researchers built a wall of 56 charged succulents and found it bright enough to read a book beside.
Rick Good spent ten years in the newspaper business, including with The News & Observer (Raleigh, NC) and The Greenville News (Greenville, SC). He co-wrote, with Melinda Coleman, Rutledge to Riley: Governors of South Carolina, 1776–Present (Published by The Greenville News), and is the author of Mind Games Trivia #1 (Amazon). He has recently spent 15 years creating original trivia content through Sounds Good Mobile Entertainment and continues that with his new company, SGME Software. He edits The Smart Reader’s money, real estate, and business coverage.
