When Should You Fertilize Blueberry Bushes?

Blueberries not only taste wonderful but are filled with nutrients such as vitamin C, manganese and antioxidants that can help ward off diseases. However, the high cost and low quality of blueberries in the store may keep you from enjoying this fruit. Luckily, blueberries aren't difficult to grow and one mature bush can yield several pounds of berries. Soil pH and proper fertilization are key components of growing your own blueberries.

Blueberries are a tasty and healthy treat.

Where to Plant

Blueberries will grow in most gardens with acidic soil. Although they can tolerate full sun, they do best in an area that is shaded during the hottest time of day. Avoid planting blueberries where they will be heavily shaded most of the day. Most blueberries do best planted in the ground, but some varieties have been cultivated to grow well in pots.

Soil Conditions

Blueberries planted in soil with a pH greater than 5.5 have difficulty taking up nutrients, and fruit production will suffer. The best pH for blueberries is 4.0 to 5.0. If your soil pH is higher than this optimal range, amend the soil with peat moss or pine needles to increase the acidity. Regardless of how much fertilizer you apply to your blueberries, if they aren't planted in acidic soil, the roots can't take in the nutrients efficiently.

When to Fertilize

Blueberries planted in a good location and in acidic soil don't require heavy feedings. Fertilize once in early spring when the shrubs come out of dormancy and start to produce leaves. Fertilize again when flower buds begin to appear in May or June. Do not fertilize blueberries after July.

Type of Fertlizer to Use

Good fertilizers for blueberries are high in nitrogen and potassium with a moderate amount of phosphorus and micronutrients. Fertilizers specifically intended for rhododendrons are ideal for blueberries since both plants require similar growing conditions. Blueberry plants with leaves that have turned yellow need iron in the form of iron sulfate or iron chelate. Yellow leaves signal that the soil is not acidic enough for the blueberry plant.