Citrus trees are a versatile plant with fragrant blossoms and delicious fruit. Citrus trees are self-pollinating, which means they can successfully produce fruit indoors. For those who live in climates where the weather is too cold during the winter, indoor growing is an excellent alternative and provides a lovely house plant as well.
Combine equal parts potting soil and coarse sand in a large planting pot. This combination will ensure that water will properly drain from the pot and protect the roots from disease.
Pot the tree in the large planting pot with the tree's graft site slightly above the soil line. The graft site will look like a large knot near the base of the tree.
Water the plant every three days, or when the soil has dried out 2 inches below the soil line.
Place in a window that receives at least 8 hours of sun. The more sun the tree receives the better the fruit will taste.
Prune any suckers and wayward branches regularly to guide the shrub into a tree-like shape. Since the tree is indoors, there will not be any concern about sunburn on the trunk or fruit, so it is acceptable to create a tree with a long distinct trunk.
Fertilize the tree annually with a fertilizer that offers more nitrogen than phosphorus and potassium, such as a 3-1-1 fertilizer. Follow the instructions carefully for proper dilution.
Transplant the tree into a new container once the root system reaches the base of the old container. Use fresh potting soil and sand and carefully transplant the tree so that the root ball remains intact.
Move the plant outdoors during warmer weather to maximize sun exposure and encourage growth.