"i planted fruit trees 7 years ago but they hardly make fruit I fertilize them and water them once a week in hot summer days but it is useless what shall I do . Fruits are fleshy, with a yellow, waxy edible peel; the seeds are edible as well. Fruit trees do not need to be watered, and will not die in the winter. I don't know what to do it is frustrating. Another fruit tree that's a rose-family member is Cydonia oblonga (so is Chaenomeles, but it's an ornamental quince, not usually grown for fruit). The star fruit is quite large and also tastes sweet. The star fruit tree is around 8 years old since it was planted by my wife. Fruit can be allowed to accumulate up to three days before harvesting. Fruit trees require pollination to be able to set fruit. Also, pollination-helping beneficials like bees, birds, and wind need to be adequately present. Fruit Trees require 28 days to mature, after which they produce one fruit per day when in season. I have an orange tree planted 5 years ago it makes lots of flowers and buds but all fall not even one fruit stays on the tree. And now the star fruit tree is fruiting. These trees generally have a multi-branched bushy, rounded canopy. If your tree is not self-pollinating, it needs a compatible pollinator tree planted nearby. Extreme cold during flowering will cause the blooms to drop too early, and a plum tree fails to bear fruit. Life is said to be like a bowl of cherries, but having a cherry tree that fails to fruit is the pits. Fruit trees require exposure to cold temperatures, a period called dormancy; then warm temperatures signal the end of the dormant period and the time to begin growth and fruit production. Reasons Plum Tree not Fruiting. Roots of mature carambola trees spread beyond the drip-line of the tree canopy and heavy fertilization of the lawn next to carambola trees is not recommended because it may reduce fruiting and or fruit quality. Fruit saplings will grow during any season, allowing players to plant and prepare for upcoming season to bear fruit. The star fruit tree will grow to heights of 20 to 30 feet tall if not pruned. Like tart cherries, it's … The star fruit tree at the side of my house is very often fruitful and very often falls on its own without being picked and finally decaying itself. The use of lawn sprinkler systems on a timer may result in over watering and cause carambola trees to decline. If your tree is missing these important elements, it may bloom, but it will not likely set fruit.