Originating from China, orange trees grow well in most climates where winter temperatures stay above 25 degrees Fahrenheit. Orange trees come in many different varieties, some of which are dwarf or semi-dwarf trees. Orange trees also produce a wide range of fruit sizes and qualities. Standard orange trees can grow 22 to 30 feet at maturity and enjoy warmer, tropical or subtropical climates, as well as lots of sunlight and deep, well-draining soil. Newly planted orange trees require extra care, especially extra water to help their roots to grow deep and well-established.
Construct a watering ring on the ground around the newly planted orange tree by forming a 2-inch high and thick ridge of soil in a circle around the tree. Make the ridge ring about 2 feet in diameter around the newly planted orange tree.
Water your orange tree once every two or three days for the first three weeks after planting it. Gradually decrease the watering frequency to once every week during the following two to three months.
Keep the area around the newly planted orange tree free of weeds and grass. Hand pull any weeds that emerge in the watering ring area around the tree, or you can apply an approved contact herbicide to the weeds, being careful to not get any of the herbicide on the young tree's leaves or bark.
Begin fertilizing your newly planted orange tree only after new growth emerges. Feed 1 cup of ammonium sulfate or a 21-0-0 NPK (Nitrogen-Phosphorous-Potassium) fertilizer during the first year, spaced into three separate applications.
Protect your newly planted orange tree from frosts and freezing temperatures during its first winter. Cover the young orange tree with a blanket or tarp, securing the edges to the ground with landscaping stakes.