Gomphocarpus fruticosus (syn. Asclepias fruticosa) - Balloon plant, Family Jewels Milkweed Tree, is a species of milkweed native to South Africa. It is also common in New Zealand where it is the main host of the Monarch butterfly. This plant grows to 6 feet tall with a spread of about 2 feet. It has lance-shaped, medium green, hairy leaves. During the summer, umbels of creamy or greenish-white flowers are produced; these are followed by interesting globular seed pods which are inflated and covered with soft bristles. Flowers are a nectar source for many butterflies and leaves are a food source for monarch butterfly larvae (caterpillars).