Cotyledon Unlocking Nature's Powerhouses Buy more, save more! 2 boxes=5% off, 3=10%, 4+=15% . The cotyledons , or seed leaves, play an important role in this distinction. If the seed contains a single cotyledon , the plant is classified as a monocot. On the other hand, if the seed contains two cotyledons , the plant is categorised as a dicot. Learn what cotyledons are, what their function is, and how to care for seedlings to achieve strong, healthy plants from the start. What is a cotyledon ? Learn the cotyledon definition, cotyledon function, and about the two-leaf plants known as dicots and single-leaf plants known...