In landscape design, think in terms of visual balance. The idea is to balance the visual weight of objects in the landscape. It gives a sense of stability. The overall effect is very formal. Asymmetrical balance can be achieved with a mass planting of shrubs or a tree on one side of the house visually balancing a chimney on the other side.
Asymmetrical balance is dynamic.
It tends to suggest movement. A change in form, color, texture, or size should be gradual in the landscape. A gradual change is part of the principle of sequence. Sequence is used to direct the eye smoothly to a desired focal point like the front door or a specimen shrub. Sudden changes in appearance break the visual flow around the landscape.