Everything You Need to Know About Leylandii Leylandii trees, with their rapid growth and dense foliage, have become a staple for hedging in gardens across the UK. If you're considering planting Leylandii or already have them in your garden, here's everything you need to know. What are Leylandii trees? Leylandii trees are a hybrid species resulting from a cross between the Monterey cypress (Cupressus macrocarpa) and the Nootka false cypress (Chamaecyparis nootkatensis). They were first cultivated in the UK in the 19th century. These fast-growing evergreen conifers have become popular for hedging due to their rapid growth and dense foliage. How fast do Leylandii trees grow? Leylandii trees are known for their impressive growth rate, often reaching heights of up to 3 feet (1 meter) per year, particularly in their early years. What are the pros and cons? Pros: Leylandii trees provide quick privacy screening, act as windbreaks, and create an attractive green boundary. They'r...