I have a miniature mandarin tree and it has only ever had one fruit. I have had it for about 4 years. How can I help it to bare more fruit? I also have a miniature peach tree, is it too hot to have them in South East Queensland? It keeps dropping its leaves every year and has never had any fruit. How can I get it to bare fruit? I am a beginner gardener and have very little knowledge of citrus fruits. Is there a good book that will help me?