Plant up refers to the process of planting or filling an area with plants or vegetation. There are several synonyms available for this term. The most common synonym is "landscaping," which involves the process of designing and arranging plants for aesthetic purposes. Another synonym is "garden," which refers to an area planted with flowers, vegetables, or other plants. "Greening" is a term that also means plant up, and it refers to making an area more environmentally friendly by planting trees and other plants. "Horticulture" is another synonym and it involves the cultivation of plants for food, medicine, and decoration. Finally, "revegetation" is another synonym that refers to the process of replenishing an area with vegetation.