Is Quercus nuttallii an evergreen tree or a deciduous tree?

Nuttall oak (Quercus nuttallii) is a deciduous tree, with an upright trunk, large branches spreading and slightly drooping, and a tower-shaped crown. It reaches up to 30 m tall, 0.3-0.9 m in diameter, with a crown spread of 12 m. It generally begins to turn red in early November each year and sheds its leaves in February of the following year.

1. What difficulties exist in large-scale planting of Nuttall oak today?

1. Limitations at the source

Oak cuttings propagation is technically quite difficult, so at present it is all done through seed propagation, and the seeds need to be imported from the United States. Americans usually count the number of seeds collected that year in September, while Chinese buyers often do not begin planning to purchase the following year's seeds until the end of the year. This time gap means that when Chinese buyers want more seeds, the United States, far away in the Western Hemisphere, is already snowed in, making collection impossible.

2. Lack of existing stock

Compared with commonly used landscaping tree species such as zelkova and camphor, the nursery stock of Nuttall oak falls far short. At present, the national planting area of Nuttall oak is around 10,000-20,000 mu. Large-specimen, premium Nuttall oak is almost nonexistent, and on the current market, even buying 1,000 Nuttall oaks with a diameter at breast height of 15 or more in bulk is rather difficult. To cultivate premium Nuttall oak, only 40 trees can be planted per mu, so the existing planting area is far from enough.

2. What are the advantages of planting Nuttall oak?

1. Price advantage

In recent years, the price of Nuttall oak saplings has declined somewhat, but the price of project-grade trees has remained firm. A single 15 cm Nuttall oak costs around 6,000 yuan, a level other conventional tree species can only look up to. And Nuttall oak grows very fast, gaining 2-3 cm in a year, offering extremely high returns.

2. The Research Institute of Subtropical Forestry, Chinese Academy of Forestry began introducing Nuttall oak back in 1997. After more than 20 years of trials, facts have proven that Nuttall oak is indeed an excellent tree species for afforestation. Not only is it tall in form, with a well-proportioned crown, dense branches and leaves, and beautiful foliage, it is also colorful, with a long red-leaf period, and can change a monotonous forest appearance. At the same time, it also has air-purifying and pollution-resistant functions. In addition, its fruit can provide winter food for the small animals in the forest, making up for gaps in the ecological chain and turning a dead forest into a living one.

3. Economic benefits

Nuttall oak also has high economic value. Its wood is hard, with a fine grain, and commands a high price; it is an important raw material for producing flooring and furniture. Even when used for timber production, the returns from Nuttall oak are considerable.