Acorn tree seeds or oak

The oak tree is one of the perennial trees called Sandiān or oak. The scientific name: Quercus. There are more than 600 species of oak trees, all of which grow naturally mostly in the northern hemisphere. Many trees, especially in Australia, are called oak, and oak trees vary widely in size and growth pattern. Oak trees grow slowly, and usually do not bear fruit until they are about 20 years old. However, these trees typically live a long time, ranging between 200 and 400 years. Uses of oak trees Oak trees are considered an important source of wood. The wood of the oak is characterized by being heavy, hard, and strong, with a beautiful trunk. Producers use it to make furniture, barrels, ships, and railway sleepers (rail ties). Oak forests in Europe and America have been destroyed to obtain the wood needed for shipbuilding and house construction. Cork comes from the bark of some types of oak trees. The acorns are an important food source for wildlife. In some countries, such as Spain, poultry are fed these fruits. Many types of oak trees are used to extract tannin, which is used in leather tanning and in making blue ink. Tannin is found in the bark of oak trees, but it is also concentrated in galls (small structures like knots) that appear on oak leaves. These galls, sometimes called oak apples, contain larvae of tiny gall wasps. The plant tissues inside these galls have high concentrations of tannin.