Understanding Winter Chill Requirements
Peach varieties rely on a set amount of winter cold — called chill units — to spur them out of dormancy and back into growth. In areas with insufficient cold, peaches bloom late and fruit abnormally. With too much cold, they meet their quota early, bloom too soon and forfeit their blossoms and fruit. When purchasing peach trees, look for your USDA hardiness zone and winter chill units. Select trees with a chill requirement slightly lower than your area’s average chill. North and North Central Florida provide peach varieties with 450 to 300 chill units. Central and South Central Florida need low-chill peach varieties that tolerate just 225 to 150 chill units per winter.
Selecting the Right Spot
Peach trees adapt well to Florida’s various soils, as long as they get good drainage. Hurricane season proves challenging; the trees are very sensitive to standing water. Deep, sandy soil in full, direct sun is ideal. Peaches prefer slightly acidic soil in the 6.0 to 6.5 pH range. Good air flow is important, too. Avoid planting peach trees in low lying areas where cold air accumulates and frost settles. This is particularly important for low-chill varieties grown in more northerly regions. Keep the area under your tree’s canopy free from vegetation. Grasses and weeds compete with peach trees and steal nutrients and moisture.
Watering and Fertilizing Peaches
Florida peaches ripen in late April and May when natural rainfall is low. Trees need at least 1 inch of water per week to achieve normal fruit quality and size. Trees in sandy soils may need more. Irrigate as needed to supplement rainfall; never let peaches become visibly stressed. Fertilize your trees with granular 8-8-8 or 10-10-10 citrus fertilizers containing additional elements peaches need, such as iron and zinc. Feed trees in three equal applications: late February, late May and late July. Use a total annual fertilizer amount equal to 1 cup for each year of the tree’s age, up to an annual 9-cup maximum. Never fertilize beyond July; you risk stimulating new, freeze-vulnerable growth.
Pruning to Enhance Fruit Quality
High-quality peaches depend on good pruning. At planting, cut trees cut back to a single, 20-inch-tall stem. As lateral branches form, keep three to five main branches and remove the rest. In the first winter, cut back the primary branches by one-third; this forces lateral branches. The next year, do the same with secondary branches that formed. Keep mature trees free from crossing or crowding branches to promote an open-centered, bowl-like shape. Prune annually, right around the new year. Use sharp bypass loppers or a pruning saw, and sterilize the blades with household disinfectant before and after you prune. As your trees set fruit, thin the peaches to one fruit per 6 to 10 inches. The sacrifice pays off in fruit quality and size.