Makayla: Could I have an application form? lijek revatio The connection between milkweed and monarch butterflies is demonstrated throughout the Butterfly House. Creekside employees harvest monarch eggs from milkweed plants three times each week, at night. The caterpillars are taken to a nursery area - there are more than 300 there currently, where they are raised to adulthood. Each caterpillar eats approximately 40 milkweed leaves in the two weeks it takes to reach the adult stage, at which time it is returned to the house.