willow oak

Quercus phellos

The willow oak (Quercus phellos) is a deciduous tree native to North America that thrives primarily in temperate climates. It has a moderate growth rate, and mature trees typically reach a height of 20 to 30 meters. Its leaves are thin and long, resembling those of a willow.

It propagates naturally mainly through seeds, but cuttings and grafting are also possible. Seeds ripen in the autumn, and it is best to collect and sow them immediately. Cold storage can improve germination rates.

For cultivation, it prefers sunny locations and well-drained soil. It grows well in fertile soil, and providing sufficient water during the first few years is important. Mature trees can tolerate drought to some extent, but regular watering is necessary to support early growth.

In gardens, the willow oak can be utilized as a large tree to provide shade. It is suitable for street trees or urban greening, adding aesthetic value with its soft leaves and slender branches. Major pests and diseases include insects that damage leaves and root rot caused by fungi or bacteria that infect tree roots. Control methods require the use of appropriate insecticides when pests occur, as well as regular soil inspection and drainage management. For diseases caused by viruses or bacteria, it is advisable to seek expert assistance in severe cases.

Plant Family	Oak family
Height	12~18m
Spread	9~12m
Colors	green
Bloom Period	April to August
Water Needs	commonly
Exposure	Sunny
Freezing Resistance	-23°C

Giant oak
Quercus palustris

Japanese thorn tree
Quercus phillyraeoides