ELI5: Explain Like I'm 5

Wall–Sun–Sun prime

Let's imagine you have a wall in your backyard that gets a lot of sun. Some people like to use that wall to grow plants or flowers because they need sunlight to grow.

Now, let's say you want to make the most of that wall by setting up a special kind of watering system. You start by attaching a hose to your home's water supply and running it up to the top of the wall. This is called the "wall" part of Wall-Sun-Sun Prime.

Next, you attach special nozzles to the hose that spray water down onto the plants below. But here's the clever part: you position those nozzles so that they also reflect sunlight down onto the plants. This is the "sun" part of Wall-Sun-Sun Prime.

But there's still one more step. You don't want to waste all that precious water and sunlight if it's cloudy or if your plants don't need water at the moment. So you install a special sensor that can detect how much sun is hitting the wall, and how moist the soil is below. If the conditions are right, the sensor will activate the watering system automatically. This is the "sun prime" part of Wall-Sun-Sun Prime.

So overall, Wall-Sun-Sun Prime is a clever way to use a sunny wall to grow plants more efficiently. By combining water and sunlight in just the right way, you can make sure your plants get what they need, when they need it.