The Washington Park Botanical Garden contains 9,000 square feet of greenhouse area, plus a conservatory which houses over 150 species of tropical plants. Surrounding the conservatory are a variety of gardens, including a 5,000 plant rose garden, the largest of its kind in central Illinois, a scent and texture garden for the visually impaired, an iris garden, perennial border, Betty Mood Smith Rockery, and Roman Cultural and outdoor cactus gardens.