Native to the south, rabbiteyes lengthen out the picking season into August. At least two varieties are needed for cross pollination. Most of these need a minimum of 350 chill hours, making them marginal for the area. I'm going to give them a shot, though.
A new breed of early ripening blueberry, Southern Highbush (also called Tetraploids) are a cross between Rabbiteye and Northern Highbush blueberries. Everything is different about these guys: the plants are smaller, the leaves look different (thicker and more crinkly) and they ripen early and bear more heavily than Rabbiteyes. These beauties need a soil high in organic matter for best production. Most of these need 300 or fewer chill hours. (Descriptions are from here.)
- Misty: Appears to be more susceptible to infection and death by blueberry stem blight than most other southern highbush cultivars. 'Misty' tends to produce very heavy crops, even as young plants. Over-fruiting predisposes blueberry plants to stem blight.
- Gulf Coast: 1987 USDA release, very early harvest season (same as Sharpblue), 200-300 chill hours, medium-sized fruit, pedicels tend to remain attached to fruit at picking, otherwise a very good cultivar.
- Sharpblue: UF release, the most commonly grown southern highbush cultivar, very early harvest (50% of fruit ripe by late April or early May in Gainesville), very early flowering, 150 chill hours, moderately productive, medium-sized fruit of high quality if handled carefully, susceptible to several fungal leaf spot diseases, although plantings containing only a few plants tend to escape serious leaf disease problems.
- Windsor: is vigorous, with stout stems and a semi-spreading growth habit. Windsor appears to be best adapted to north-central Florida but has been grown successfully as far south as Hardee County.