Citrus indoor trees are grown in containers and usually receive less light than citrus trees grown outdoors in the ground. As a result, citrus indoor trees are smaller trees with different nutritional needs. If you want to grow citrus indoor trees, evaluate the indoor space where you will place the citrus tree. Choose a large, south-facing window as a starting point; citrus indoor trees must receive a minimum of eight hours of sunlight each day for healthy growth in USDA hardiness zones 8 through 10. Close any vents near the future tree location. Although the orange tree needs fresh air, it prefers humid air over the dry air supplied through a common air-conditioning or heating system. Consider a humidifier within the space if your home has excessively dry air. If you are concerned these trees will be high maintenance, don’t worry. They are actually quite hardy and apapt well to almost any environment.
The key is giving them enough sunlight. Place citrus indoor trees in an area where they will get about six hours of sunlight per day, preferably a southern or western exposure. Water your tree once a week or when the soil is on the dry side of moist. Also, since fruit trees in general like humid conditions, mist them with tepid water from a spray bottle two or three times weekly. Although it’s not required, these indoor trees will enjoy being outdoors in the warm summer months.