If you've ever looked out the window of the International Space Station while passing over southern Ontario, you'd spot it immediately: a sprawling, otherworldly bloom of hot pink and canary yellow pulsing against the dark landscape below.
That's not a city. That's dinner.
North America's Greenhouse Capital
Tucked into the southwestern corner of Ontario, the communities of Leamington and Kingsville are home to the largest concentration of greenhouses on the continent. Stretching across thousands of hectares, this agricultural powerhouse produces tomatoes, peppers, cucumbers, and more year-round — and it relies on powerful artificial grow lights to do it.
Those lights burn bright enough to be visible from orbit. Astronauts aboard the International Space Station have snapped striking photos of the phenomenon, capturing that eerie, luminous glow rising from Ontario's agricultural heartland like a bioluminescent jellyfish floating in the dark.
Why Pink?
Greenhouse grow lights are typically a blend of red and blue LEDs — and together, those two wavelengths produce that unmistakeable hot pink or magenta glow. It's not an aesthetic choice: plants absorb light most efficiently at the red and blue ends of the spectrum, making this combination ideal for maximizing crop yields year-round, even through the grey depths of a Canadian winter.
Older high-pressure sodium lights emit a warmer, amber-yellow hue — the canary colour also visible in aerial shots of the region. Many operations are now transitioning to more energy-efficient LED systems, but the brightness hasn't dimmed.
A Booming Industry With a Glowing Side Effect
Ontario's greenhouse sector is worth billions of dollars annually and employs tens of thousands of workers across the province. The Leamington-Kingsville corridor has seen explosive growth over the past two decades, constantly expanding what's already been dubbed the greenhouse capital of North America.
But that growth comes with a hard-to-ignore side effect: light pollution. Residents and local municipalities have raised concerns about the glow disrupting sleep, affecting local wildlife, and permanently altering the character of the night sky in surrounding communities. Kingsville has begun examining municipal bylaws around greenhouse lighting in response to neighbour complaints — a delicate conversation when the industry is such a major economic driver.
Feeding Canada, One Glowing Acre at a Time
It's a tension that speaks to something larger: the real trade-offs involved in producing food at scale in a northern climate. Greenhouse operators argue year-round production is essential to Canadian food security and that the lights are simply the cost of growing tomatoes in January. Local governments are searching for a middle ground that protects residents without kneecapping a pillar of the regional economy.
For now, the glow continues — a neon signature of just how much of Canada's fresh produce comes from a surprisingly small patch of land on the northern shore of Lake Erie.
Source: CBC News — Windsor
