You may think that growing citrus trees requires you to live in a tropical climate. Fortunately for you, if you have a room in your house that gets a lot of full sun, you may still be able to grow citrus trees indoors. The key lies in choosing dwarf varieties that will grow in pots inside your house. If you live in an area with hot summers and cold winters, you might consider moving your citrus outdoors in the spring and indoors before the first frost.
General Growth and Care
Select only dwarf citrus varieties, which have been bred to stay relatively small. As long as you have a window in your house that gets full sun, a dwarf citrus tree will grow happily in your house.
Plant your dwarf citrus in a slightly acidic potting soil mix. This will usually be a mix that contains a lot of peat moss. Choose a pot that is double the size of the root ball, at the very least. You may need to repot into a larger one later in the tree's life.
Apply a citrus-specific fertilizer per the manufacturer's instructions.
Monitor your temperature and keep it between 55 and 85 degrees Fahrenheit.
Stick a moisture meter into the pot with your tree. This simple device will tell you when your tree needs water. It makes it very difficult to over- or underwater your tree.
Mist the foliage of your citrus tree often, especially during the harsh winter months. Even though the tree is living indoors, the air is still much drier during the winter. A humidifier will also work wonders, if you have one.
Identify the parts of the flowers on your citrus tree. The stalks in the middle of the open flower are called stamens. These hold the pollen on their tips. The bowl part of the flower is called a pistil.
Swab a small, round paintbrush across the stamens to gather pollen. Pollen comes in different colors, and will usually range from white to yellowish-orange, depending on the tree's species.
Aim the pollen-coated tip of the brush down into the pistil of the flower. Swirl and wipe the pollen off so that it falls neatly inside the flower.