Avocados can grow up to 12m in height but are generally managed through pruning to around 4 or 5m. Best in warmer climates with some summer rainfall, trees are frost-tender until established and need good drainage to thrive. A number of varieties are available and at least two different trees are needed to ensure fruit is produced. The variety 'Hass' has a thicker skin and will fruit as far south as Melbourne. 'Shepard' will do well in tropical zones.