So, what happens to the water once it has served its purpose? On the leaves of the plant are tiny holes called stomata. They don’t actually need to drink though, the only purpose the water served was being the Uber to transport the nutrients up through the plant. The roots draw the water up from the ground and carry it up into the stem, leaves, and flowers, fruit, or vegetables. Plants have the same concept, they draw water up, they do not take in anything but heat and light through their leaves. Think of a straw, you cannot drink water through a straw by blowing into it, it is a one-way passage for drinking. Water flows in one direction only, up from the ground through the stem to the leaves and flower. Soon you have a beautiful flower or tasty vegetables. They need to move the nutrients to all the parts of the plant that need them using water as a transport system. The roots are the part of the plant that draws up nutrients from the soil for the plant to grow. The roots reach either straight down, or they branch out almost horizontally. The first part of the plant that grows from your seed is the roots. Your seed needs water from the air and or the water table. Your seed needs nutritious soil to grow in. Therefore, I am going to start with the basics: Biology 101. To understand the need for temperature and humidity control in your greenhouse, there are a few basics you need to understand about what plants need to survive.
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