Kumquat trees that are grown indoors are known as dwarf trees. They produce a bright orange fruit that is 2 to 3 inches long. They stay ripe on the tree for quite a while, offering the opportunity to eat the fruit fresh off the tree. The tree will grow as tall as 10 feet in a large container and stay window-sill size if kept in a small container. Kumquats are used for making sauces, marmalades and deserts. The trees give your home a sweet fragrance all year long.
Mix a few handfuls of compost with a sandy potting soil and fill your container to 3 inches from the top. The container should have drain holes covered with a cheesecloth or screen. Place the container on a run-off tray.
Move the soil to create a hole in the center that is a couple of inches deeper and wider than the root ball of the tree. Make a mound in the bottom of the hole.
Carefully take the tree out of its original container and knock away the soil. Spread the roots over the mound in the hole and check to make sure the tree is planted at the same level as it was in its original container. Adjust the height if necessary.
Cover half of the root ball with soil and apply just enough water to compact the soil. Finish filling in around the roots with soil and press down firmly to tighten the soil around the trunk.
Water thoroughly and place the container in an area that gets between 5 and 6 hours of sun a day. Take the container outdoors in the summer for some fresh air, but remember to bring it in when weather gets cool or storms are coming.
Water when the top of the soil starts to feel dry until the soil feels moist again. Fertilize once a month with a fruit tree fertilizer diluted to half strength. Follow the manufacturer's directions on amount of fertilizer and then cut in half. Fertilizing more often with less fertilizer will yield more fruit and foliage.The tree will flower and fruit intermittently throughout the year.