Blueberries grow best in low-pH (acidic) soil with a pH between 4.0 and 5.1. Fertilize in early spring and again in early summer with an acidic fertilizer. Osmocote makes a slow-release fertilizer for acid-loving plants; something like that would be ideal. Mulching your plants with shredded oak leaves, peat moss, or pine needles will not only retain soil moisture, but can help ease the soil pH toward the acidic end of the spectrum. Water deeply once a week during this first season. Next year, re-mulch them and water deeply only when your area experiences a prolonged dry spell.