The garden is organized into a series of distinct themed sections, each with its own character and focus. The overall layout encourages exploration, with winding paths that lead you from one environment to another in a way that feels natural rather than choreographed.

The English Cottage Garden is one of the most beloved sections, overflowing with flowering perennials arranged in the loose, abundant style associated with traditional British garden design. In summer, this area is a riot of color and fragrance. Nearby, the Shade Garden offers a quieter contrast, with ferns, hostas, and woodland plants thriving under a canopy of mature trees. It is a genuinely restful space that feels noticeably cooler and calmer than the rest of the garden on a warm Madison day.

The Rock Garden is another highlight, featuring plants from alpine and arid environments arranged among carefully placed stones. It is a surprisingly dramatic section that demonstrates how effective thoughtful plant selection can be, even without lush greenery. The Water Garden adds a reflective element to the experience, with a small pond supporting aquatic plants and providing a focal point for that corner of the space.

Throughout the garden, every plant is labeled clearly, making the space genuinely useful for anyone trying to learn more about specific species, growing conditions, or design principles. This detail is one of the things that makes Allen Centennial Garden distinctive among public green spaces in Madison.