It explains why, for example, people in south Florida can’t grow apples or blueberries; and why people living in the northern part of the state can’t grow exotic tropical fruits, such as papaya or mangoes.
Most fruits that grow in the northern part of Florida are deciduous, which means that during the winter the trees lose their leaves and go into a period of dormancy, or rest. During this rest period, the tree must be exposed to chilling temperatures. This exposure to the cold prepares the plant to resume active growth in spring.
Temperatures below 45 degrees Fahrenheit accumulated throughout the winter determines the total hours of chilling. Species differ in the amount of chilling they need in order to completely rest and resume growth. This is known as the plant’s chilling requirement. Lack of enough chilling results in sparse foliage and little to no flower production. And if there are no flowers, there will be no fruit.
Our area receives between 400 to 650 hours below 45 degrees Fahrenheit during the average winter. This provides enough chill hours for the Anna, Ein Shemer and Dorsett Golden apple varieties; however, it does not provide the chill hours required for many of the other more common varieties such as Red Delicious and Golden Delicious.
This same environmental factor is true for most deciduous fruit trees. For example, some of the better known peach varieities, such as Elberta and Bell of Georgia, perform poorly here following most winters. Both require about twice as many chill hours as we receive during most winters. There are at least 10 peach varieties that perform OK in our area.
Selecting the wrong variety is only one of the disappointments experienced by those wishing to grow fruits in Floria. Even when the correct variety is selected, many fruit enthusiasts are disappointed to see insects eating their fruit, diseases causing their fruit to rot or possibly all their fruit falling to the ground before it is ready to be eaten.
In order to be successful with fruit production to be successful a person needs to ask a lot of questions before planting the first plant. Which varieties grow well here? How much care is needed to grow this type of fruit? Do I have the time to devote to pruning, spraying, fertilizing, watering, etc.
If you do not know the answers to these questions, talk to a knowledgeable employee at a local, reputable nursery or call the UF/IFAS Extension Office in your County before choosing to plant fruit trees this fall or winter.