There are hundreds of varieties of fruit grown by a multitude of fruit trees. Of all the variety and species of fruit trees in the world, each can be traced back to one of four categories of fruit tree. These four categories are divided by the type of core produced by the fruit; there are simple single seed fruits, single core fruit, multiple seeded fruit and fruits that develop without seeds.
Look to the berry fruit tree to produce fruits such as tomato, cranberry, currant and banana. These fruits grow from a single ovary. According to the California Rare Fruit Growers Incorporated, the banana is grown as a seedless fruit commercially but can be crossed with seeded banana, which grow wild. Look for berries from the Staghorn Sumac; these berries can be used for soar throat in the Appalachia region of the US states the Forrest Service of the US Department of Agriculture.
Identify citrus fruits by the juicy pulp contained in a hard, sometimes edible, casing. Fruit trees that grow citrus fruit include oranges, lemons, limes, grapefruit and kumquat. Look for citrus fruit trees mainly in Florida and California where the temperatures are hot and the climate is more tropical. Orange trees in Florida produce the most oranges in the US and rank second in harvest in the world.
Find a center full of seeds in this category of fruit. The outer casing is tough but edible. Fruit trees that grow pome fruits include the pear, apple, hawthorn and loquat. Look for a moderate growth rate. Requirements of these trees include full sun and a cold dormant season. The most common fruit tree in this category is the apple tree because it is grown in every part of the US states the extension service of the University of Illinois. Cornell University states that one of the oldest pome fruits, the apple, has been raised in Asia for over 3,000 years. Pear trees as we know them today are a hybrid of wild pear trees found in Europe states the Cornell extension service.
Look for stone fruit to have a hard center core and edible outer shell. Fruits in this category of fruit tree do not have seeds but rather one large drupe in the center. Fruit trees of the stone fruit category include plum, peach, cherry, nectarine, apricot and almond. Stone fruit trees can produce a harvest up to 25 or 35 years; almond trees can be harvested for 50 seasons. Good harvests can be had when these trees are planted in soil with good drainage or well drained raised beds according to Texas A&M University extension service. The extension service also recommends not growing fruit trees in areas prone to standing water. Colorado State University recommends pruning trees for maximum yield.