If you have citrus trees in your garden then you will be enjoying the fruit right now. If not then winter is a great time to plant citrus trees and with many dwarf varieties, your garden size no longer matters. For that matter they can be successfully grown in a pot, they just need more regular watering and feeding.
I think citrus and herbs are an essential in every home garden and each can be grown very easily these days with so many great stacking & decorative pots available. If space is an issue, look out for multi grafted fruit tree varieties but try to restrict the plant you choose to no more than 3 different fruit varieties otherwise you will find that the plant will not perform with the stronger stock taking over anyway. Personally I have a multi grafted Tahitian Lime and a Kaffir Lime which I think is a great addition to my garden. The Kaffir Lime provides the leaves that I add to my Thai dishes and the Tahitian limes are so juicy providing the necessary ingredient for so many lovely recipes and drinks.
Take a look at The Fruit Salad Tree Company for multi grafted stock.
Citrus do very well in pots.
Ensure that you water and ferilise regularly.
Possum can be a real issue in the garden.
Plant native species to distract them.
In the subtropics the warmer weather comes around very quickly, triggering another flowering & fruit for next year. Take the time over the next couple of months to give your citrus a trim, removing any branches that have been affected by gall wasp. Keep your plant open, allowing light and airflow to access the middle of the plant structure. Applying a good organic fertilizer specific for citrus, along with a good helping of mulch, will set your fruit trees up for another six months (if they are in the ground). Once fruit has set, supplemental watering will be required during dry periods to ensure your fruit sets and is juicy.