Gibberellins are one of five classes of plant hormones. Gibberellins are the plant hormones which regulate growth. These hormones are expressed in stem growth, cell division, and other characteristics of plant development. They also play a natural role in flowering plants, regulating flower development and seed formation. Gibberellic acid, the first gibberellin discovered, also promotes the growth and size of fruiting bodies on plants. These hormones are used extensively in botanical research, agriculture, horticulture, and gardening for plant growth, supplementing the fertilization process and in some cases correcting underdeveloped plant growth, usually using either "plant growth hormones" which are basic gibberellins or more exotic combinations of materials.
Examples of Gibberellins:
Chemical structure of gibberellin.