True leaves grow shortly after the cotyledons. The purpose of these leaves is to provide stored food to the seedling for a short period of time. These leaves will look different from leaves that will grow later. When you plant a seed, the first leaves to emerge are the cotyledons. The general rule of thumb is that when a seedling has three to four true leaves, it's large enough to plant out in the garden (after it has been hardened off). The best way to judge if a plant is large enough to plant out in the garden is to look at the number of true leaves. If there is not enough light, a plant can grow very tall very quickly, but this plant may or not be ready for planting out. Also, the amount of light a seedling gets can influence how quickly a plant grows in height when you are raising plants from seeds. When it comes to how to transplant seedlings, there is no hard and fast rule to how tall a plant should be before you put it out in the garden, due to the fact that different plants grow to different sizes. If you wait too long, your seedling may become pot bound in its original container. If you put them out before they are ready, they may have a hard time surviving the elements. One common question from people who are growing plants from seeds is, "How do I know when my seedlings are big enough to put out in my garden?" This is a good question to ask when learning how to start plants from seeds because planting seedlings out in the garden at the proper time is crucial to their development later on.
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