You need to supplement potassium in summer. With one plastic bottle, you can grow dozens of potassium-rich foods at home.

Summer is here. Whether you are an adult or a child, you need to pay attention to getting enough potassium. After all, only when all kinds of trace elements in the body are satisfied can a person live a healthier life. In fact, the onions we often eat contain a lot of potassium. Eating onions regularly in summer can promote our health. Isn't that exciting? What's more, onions like this can be grown by the dozen at home. All you need is an empty plastic water bottle and some soil. It is very convenient. Now let's get started together.

1. The first step is to poke some small holes in the bottom of the plastic bottle for drainage and airflow.

2. For the second step, pick up our scissors again and cut a few small holes in the body of the bottle. They should not be too big, about the size of a finger. These holes are for placing the onions.

3. Put some small stones at the bottom of the bottle to improve drainage.

4. Then fill the bottle with soil. Plant one onion, then add a layer of soil.

5. Finally, it is just routine watering and fertilizing, then waiting for the onions to grow. After the onions grow up, they look like this. Isn't it spectacular and satisfying? Have you learned this very simple onion-growing method?