Blackberries like a sunny spot with well-drained, fertile soil. Plant in fall or winter, spacing them 3 to 4 feet apart. Mulch with pine straw or shredded pine bark to conserve moisture and discourage weeds. Prune old canes right after fruiting to encourage new canes and discourage diseases.
Light:
Cultivated blackberries require full sun for good flowering and fruiting. Many types of blackberries tolerate partial sun as well, but this usually results in fewer and slower-ripening berries. Try to provide at least six hours of direct sunlight a day.
Soil:
Blackberries require slightly acidic, well-drained, organically rich soil in order to thrive. The plants do best in loam or sandy loam soil. Loosen the soil to a foot deep and add compost or aged manure to improve drainage if needed. Raise the soil level higher if poor drainage is a problem.

Water:
Though they are drought-tolerant plants, blackberries will produce the best fruit if they receive 1-2 inches of water a week while berries are present. Water deeply a couple of times a week when plants are first getting established and during hot, dry weather. Mulch around the plants to conserve moisture. Watering is rarely necessary in winter or while the plant isn't fruiting

For many of us, one taste of a blackberry cobbler instantly brings back thoughts of childhood summers spent picking berries. Blackberries are some of the first fruits of the season. White flowers in spring are followed by clusters of fruit that turn from green to red to purple before ripening to black