Which of the following are common types of landscape plants?

The most commonly recognized types of landscape plants include trees, shrubs, and perennials. Trees are foundational elements in landscape design, providing structure, shade, and habitat. Shrubs contribute to the aesthetic and functional aspects of gardens, often used for borders, hedges, and screening. Perennials, which come back year after year, add color and diversity to landscapes, enhancing their seasonal beauty and ecological value.

While the other options include plants or elements that can be found in landscapes, they do not represent the main categories of landscape plants as widely used in horticulture. For example, roses and tulips (found in the first option) are specific flowering plants rather than broad categories. Ferns, grasses, and cacti present in the third option might be used in specific landscape scenarios but do not encompass the variety of options typically utilized across diverse landscapes. Lastly, bamboo, mushrooms, and algae in the fourth option include non-traditional plants and non-vascular organisms, which are not generally categorized as typical landscape plants in standard horticultural practices.