Watering is by far the greatest chore of container gardening and it needs to be done generously and regularly. Rain is never adequate on its own and can fool you into thinking the containers are wetter than they really are. Automatic irrigation is well worth considering for a large container garden.
Container-grown plants are those that are really well established in pots, polyethylene bags or anything else which will ensure that all the roots and the soil around them can be transported and planted with the minimum of disturbance. Although more expensive than bare-rooted or balled plants, container-grown plants can be put in at any time of the year when the soil is in good working condition. Most of the shrubs and climbers offered for sale in garden depots are container grown.
Habits are irregular; in wild, cockateels walk through grass heavy with dew. Use large container such as large flower pot saucer; fill container with water and place in cage at same time each day in early morning. Remove container after about an hour, whether or not birds have bathed.