Eucalyptus perriniana easily grows 2m (6 feet) per year if watered well during the summer
During extreme drought in summer irrigate abundantly. Many plants in the jungle garden expect generous rainfall in the summer, and if that fails, these plants are forced to rest and therefore loose a lot of leaves.
If you want to plant new plants in the garden during the summer holidays, you must irrigate them regularly! Eucalyptus trees in particular require a lot of water in their first growing season, and also bamboos are very thirsty plants.