Answer: Seeds are little embryos with all of the essential nutrients they need to sprout packed within. Once the seed has sprouted, roots explore the soil looking for moisture and nutrients, and the new little leaves, when exposed to light, start the process of photosynthesis (manufacturing food for the roots). After the roots and leaves have developed, the original nutrients packed around the embryo will have been depleted, and that's when fertilizer helps the plant to grow. Because there's a limited supply of essential nutrients packaged with the seed embryo, it's important to plant seeds at the proper depth. If planted too deeply, the baby plant will run out of energy before it sprouts leaves. Hope this answers your question!
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