The horticultural department propagates thousand of specialized plants to feed caterpillars, and flowering specimens to provide nectar for adult butterflies.
Caterpillar food plants such as the Passiflora (flowering passion vine) are essential; their smell attracts adult butterflies, and they lay their eggs there.
Blossoming nectar plants include Zinnias, Buddlea, Salvia, Pentas, Porterweed, and Clerodedrum.
