First off, a cactus doesn’t chow down on a taco or a slice of pizza. It doesn’t eat anything solid—no chewing, no swallowing. Instead, it’s a master of extreme meal prep using only air, water, and sunlight.
Think of it as a tiny, green solar-powered factory. It eats sunlight through a process called photosynthesis. That’s its main course, every single day.
But here’s where it gets sneaky. Unlike your houseplant that guzzles water, the cactus is a uber-efficient miser. It stores every drop it gets, then photosynthesizes super slowly.
So, Sunlight Soup and Water Crumbs?
Basically, yes. But let’s talk about the real menu. Cacti get their carbon dioxide from the air, just like we do. But they do it at night when it’s cooler, so they don’t lose precious water.
They open their pores (called stomata) at night, breathe in CO₂, and store it as malic acid. Then during the day, they use sunlight to turn that acid into sugar. It’s like having a late-night snack that turns into breakfast.
So what does a cactus eat? Sunlight, carbon dioxide, and water—in that order of importance. But wait, there’s more.
Which Edible Cactus Species Are Safe To Eat | ShunCy
