Blueberries are susceptible to root rots in poorly drained soils. Gardeners with poorly drained soils can improve drainage by incorporating organic matter and planting in raised mounds or beds. Soil pH is also extremely important. Blueberries require an acid soil of pH 4.0 to 5.5. Since the pH of most Iowa soils is above this range, the soil pH must be lowered to successfully grow blueberries.
Gardeners can lower their soil pH by adding Canadian sphagnum peat to the soil.
Highbush blueberries are hardy in central and southern Iowa. Plants develop into 6 to 8 foot shrubs. Suggested varieties for Iowa include 'Blueray', 'Patriot', 'Elliott', 'Coville', and 'Collins'. Half-high blueberries possess greater cold hardiness and are the best choice for gardeners in northern Iowa. Suggested varieties are 'Northblue' and 'Northsky'.