My Wendouree garden has a flourishing citrus grove, including a tahitian lime which annually produces a bumper crop. It is, in fact my most prolific cropping citrus!
Meyer lemons are considered the best frost and cold tolerant citrus variety, and generally produce excellent crops in Ballarat, but their fruit is way sweeter than other lemons. My Lisbon lemon regularly crops well, whilst my Eureka, also produces a respectable crop, but nothing like the extraordinary yields from my experience of this variety in Melbourne!
I am also trialling a finger lime, a citrus indigenous to northern New South Wales. It is too young to have yet fruited, but the tree is establishing well.
Cumquats in pots, in a sheltered north west facing position alsos thrive. Those here are well over 20 years old and still producing well.
I have also known friends and neighbours to get excellent harvests from both pink and standard grape fruits.
Last year I lost a sapling Imperial Mandarin, not to frost, but from Whippet Boy's ring barking efforts, so I intend replanting this, as well as my favourite variety; Blood Orange!
Before you go out and purchase as many citruses as I have, make sure you have an ideal position, protected from both wind and frost. I recommend a sheltered north-west spot. If you can provide this then most citrus varieties I have mentioned here will be very happy and reward you with a good yield.
One huge advantage of growing citrus here, is that gall-wasp doesn't seem to enjoy our cool, windy conditions.
I prune my citrus to allow good air circulation in late August. In early autumn and spring, I feed them with blood and bone and lashings of well rotted cow manure, and mulch with peastraw in spring, keeping the mulch well away from the trunk, to avoid fungal disease.
Any sign of yellowing leaves is a signal to apply iron chelates, as it indicates a deficiency of iron in the soil.
Citrus benefit from a good weekly watering in summer, but during the drought still bore fruit with very irregular watering. Most of this was from grey water sources. All continued to fruit well!