We have already begun harvesting our deliciously sweet blackberries. Thornless blackberries thrive in southeast Louisiana's warm climate and should be harvested from late June to early August, depending on the variety. To determine if the berries are ready, look for a deep, rich color and a slight softness when gently squeezed. During the growing season, regular watering is essential, particularly in dry spells, applying mulch can help retain soil moisture. Additionally, pruning in late winter encourages healthy growth and fruit, ensuring your thornless blackberry plants are productive year after year.