Willow is generally more expensive than larch. This is primarily due to the demand for willow as a fast-growing, versatile wood, as well as its popularity in certain applications such as erosion control and biomass energy. Larch, while also a valuable wood, is less sought after and thus tends to be less expensive.

The price difference can be attributed to several factors. Firstly, willow is known for its rapid growth, which makes it a cost-effective choice for projects requiring large quantities of wood. This demand drives up the price, especially for high-quality willow varieties. According to the U.S. Forest Service, the average price for willow logs in 2020 was around $1.50 per board foot, compared to $1.00 per board foot for larch logs.

Additionally, willow is often used in the production of biomass energy, which is a growing industry in the United States. The high demand for willow biomass has further increased its price. On the other hand, larch is more commonly used in construction and furniture making, where its price is influenced by factors such as availability and market demand.

Furthermore, the cultivation and harvesting processes for willow and larch can also impact their prices. Willow is typically grown on short rotations, which means it can be harvested more frequently than larch. This frequent harvesting can drive up the cost of willow due to the need for ongoing management and maintenance. Larch, on the other hand, is a slower-growing species and is often harvested on longer rotations, which can help keep its price more stable.

In conclusion, willow is generally more expensive than larch due to its high demand, versatility, and the costs associated with its cultivation and harvesting. While both species have their own unique applications and value, willow's popularity and utility in various industries make it the more expensive option.