Concept:Maintaining ornamental plants means caring for them regularly to keep them healthy and attractive.
It does not involve collecting produce for use or sale.
Explanation:Pruning removes unwanted or overgrown parts, such as branches and leaves, to improve plant shape and growth.
Weeding removes unwanted plants that compete with ornamental plants for nutrients, water, and sunlight.
Watering supplies the moisture needed for normal growth and survival.
These three practices are routine maintenance activities for ornamental plants.
Harvesting is the act of gathering mature crops or products for consumption, storage, or sale.
Ornamental plants are grown mainly for their beauty, not for harvesting.
Therefore, harvesting is not a way of maintaining ornamental plants.
Answer:D. Harvesting