Oak (Quercus species)
Oak trees are native to North America and are valued for the hardiness and stature. As Iowa’s state tree, oaks are found naturally growing in forest stands and woodlands. Oak trees are planted in public spaces and home landscapes.
Hardiness- Varies with the species of oak tree, ranging from zone 3 to zone 9.
Growth Rate- slow to medium
Mature Shape- broad, rounded
Height- Varies with species. Often maturing between 50 to 75 feet tall. Capable of growing upwards of 100 feet.
Width- 40 to 70 feet. Varies with species.
Site Requirements- Best growth in moist, well-drained soils. Adaptable to adverse soil conditions.
Features- Oak trees have very hard wood and are not extremely susceptible to wind and ice damage. Spring foliage, acorns and attractive fissured bark add to the beauty of the tree.
Recommended Varieties for Iowa- Among others, black, red and burr oak perform well in Iowa. Pin oaks should be avoided. Many Iowa soils have a pH to high for pin oaks, resulting in a yellowing of the leaves known as iron chlorosis.