Plants that can be grown for ornamental purposes.

Landscaping
Plants that adapt well to common landscaping practices.

Avenue
Plants that can be used to line streets, without being overly disruptive (like lifting sidewalks with their roots), messy, or dangerous by dropping large fruits, seeds or branches.

Shade
Trees that are planted to provide shade.

Hedge
Plants of reasonable growth and moderate size that can be planted as a hedge to provide privacy. Most are tolerant of severe pruning to keep them in shape.

Fence
Plants, often spiny, that can be planted as a fence which will keep animals or humans from being able to climb through.

Ground cover
Low growing plants that will spread to form a carpet of vegetation.

Mass planting
Plants that can or should be planted in great numbers to achieve their best effect.

Bonsai
Plants, usually trees, that can be trained as a bonsai.

Potted
Plants that will do well growing in a pot.

Indoor
Plants that can cope well with the hostile conditions inside a human habitation, mainly low humidity and low light levels.