Have you ever heard of when plants are thirsty? They need water to survive and grow big and strong. But sometimes, they don't get enough water and this makes them feel stressed out. This is called moisture stress.
Now let's imagine you are playing outside on a hot day without any water to drink. You might start feeling tired and your mouth will feel dry. That's the same thing that happens to plants when they don't get enough water. They start feeling tired and their leaves will start wilting.
When there's not enough water for the plant, it can't take in the nutrients it needs to grow properly. Just like how you need food to grow big and strong, the plant needs water to grow big and strong. This type of stress can also make the plant more vulnerable to diseases and pests that might want to eat it.
Farmers and gardeners have to be careful to give their plants enough water so they don't experience moisture stress. They might use irrigation or sprinklers to give the plants the water they need. But they also have to be careful not to give them too much water or that can cause problems too.
So remember, moisture stress is when plants don't get enough water and they start feeling stressed out. Just like how you need enough water to stay healthy, plants need water to grow big and strong too!