Support in young herbaceous plants is provided by turgidity. Turgidity refers to the state of being swollen and distended due to the absorption of water by the vacuoles in the plant cells. In young herbaceous plants, the cells are packed with water, which causes them to become turgid and stiff, providing support for the plant. This is why young plants that lack turgor pressure wilt and become limp. Therefore, turgidity plays a vital role in supporting young herbaceous plants.