Mostly grown for their sweet fruit, miniature orange trees are also aesthetically pleasing with shiny, dark green foliage and white fragrant flowers that bloom a couple times a year. Miniature orange trees will typically grow to heights up to 3 feet in containers and can be expected to produce fruit the first year they are planted. Growing your own orange tree is possible even in colder climates so you can enjoy this healthy citrus fruit year-round.
Use a well-draining soil in which to grow your miniature orange tree. A good mixture contains equal amounts of loam, sand and peat moss. To amend your own potting soil simply mix in equal parts of loam, sand and peat moss before planting your tree in the container. Be sure to use a container with drainage holes in the bottom to allow good drainage.
Water your tree deeply, but infrequently once a week. When the water runs out the drainage holes in the bottom of the container you have watered it deeply. If you set your tree outdoors on a sunny day, you might need to water the tree once a day. Do not let the soil dry out in between waterings. If you do, the leaves will wilt and become dull looking.
Keep the humidity level high for your tree when indoors. To do this, add water to a pebble-filled tray to the top of the pebbles and set your container on top of the pebbles in the tray. Be sure the container sits right above the water line; empty some of the water out of the tray if the container is sitting in the water. Also, keep the leaves misted daily with water to maintain healthy foliage and discourage red spider mites and other pests. If your tree dries out, the leaves will drop and the branches will dry out.
Set your tree in a sunny location where it will get at least six hours of direct sunlight. Setting your tree in front of a south-facing picture window works well, or, during the summer, you can set the plant outside. Most citrus trees do well in temperatures of 70 degrees Fahrenheit or warmer. If the temperatures drop below that, bring your trees inside.
Fertilizer your tree once it is well-established. It is best to wait at least six weeks after planting a tree to feed it. Feed your orange tree with a general all purpose fertilizer that is higher in nitrogen with the ratio around 25-15-15. Feed your tree once a month; if the tree stops flowering and producing fruit you can fertilize twice a month. Do not feed during colder months when your tree will be more dormant.