The Sun Garden displays succulents and other plants of arid regions. This includes cacti and euphorbias and other drought-tolerant species such as agaves, yuccas and grass trees. Succulents have fleshy leaves or stems that store water. In stem succulents, the stems may be green and take over from the leaves as the main organs of photosynthesis. A drainage system installed here help to simulate the dry conditions required to grow this collection.
Within the Sun Garden, the "Passing of Knowledge" sculpture garners much attention from passers-by.