Cotyledons | Noun
- Cotyledons are the first leaves that appear on a seedling. They grow as a pair, and some mutated strains can have three cotyledons. They are round in shape, and they eventually fall off the plant as it matures, grows taller and develops new leaves. In the seed, the cotyledon is the embryo of the plant, the first leaves that appear out of the soil when you have seedlings. As the seedling grows more leaves appear that resemble the cotyledons, and then leaves that look more mature.