You can also grow apples. However, you have to be patient enough to tend the plant for long, before it starts flowering. Mushrooms, edible flowers, nuts, grains and many others can be grown in your backyard, provided you have space for it. You will learn about how to optimized your space and create a better backyard farm, later in this book. You can also plant hops, for making beer.
Does backyard farming involved only plants? No, you can grow your own livestock in your backyard. These livestock will help to create a sustained environment by providing manure. Adding animals would increase the fun part too. They consume bugs and weeds and provide items, like milk. However, remember that adding animals is equivalent to adding more work and you would need more space, time and resources.