If the company won't provide them for free, invest the $10 to order one of its books from Amazon. You want to see how the books look and feel. Most authors I work with do not ask for samples, and this is putting a lot of faith into the hands of a company that's producing something so important to you.
Another good thing about corkscrew willow is its fast growth. Like most willows, it grows 24 inches or more in one year, reaching a mature height of 25 to 30 feet with a spread of 15 to 20 feet. Now for the bad news: like other willows, corkscrew willow is short-lived. Most fast-growing trees have brittle branches and are prone to breakage. Corkscrew willow is no exception.
This tree has a rounded canopy and grows to a maximum height of 70 feet and width of 60 feet. River birch trees grow rather quickly, at a rate of about 1.5 feet per year. By the age of 20 years, they usually are between 30 and 40 feet tall. Sweet birch trees (Betula lenta) are hardy in USDA zones 3 through 8. These water-loving trees feature sweet-smelling leaves and bark, which gives rise to the tree's common name. They grow at a moderate rate and present at about 6 feet tall at 12 years. By age 20, they have an average height of about 46 feet.