The cotyledons, also known as seed leaves, are the first set of leaves to emerge from a germinating seed. They usually look different from the true leaves, which are the leaves that develop after the cotyledons.

Cotyledons are usually simpler in shape and smaller in size than the true leaves. They often have a round or oval shape and may be a different color than the true leaves. True leaves, on the other hand, come in a variety of shapes and sizes depending on the plant species.

It's important to wait until the seedlings have developed their first set of true leaves before fertilizing them, as these leaves indicate that the seedling has started to establish a strong root system and is ready to absorb nutrients.
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