x Cupressocyparis leylandii, better known as the Leyland cypress, is a popular garden plant in the Cupressaceae, or cypress, family found widespread across the United States and Europe.
It was originally created in England, where a Monterey cypress and Nootka cypress were bred to create the Leyland cypress.
This crossbreeding has resulted in the Leyland cypress being sterile, meaning it must be propagated and grown from cuttings.
This evergreen tree has a conical growing habit, and carries dense sprays.
X Cupressocyparis Leylandii photograph by Cob Lands.
It can be grown in hardiness zones 6-10 (UK H6, hardy to about –20°C /-4°F), and can typically reach a height of 60-70 feet (up to 21 m) at maturity, with greater heights of up to 100 feet (30 m) being recorded. It is capable of growing 24 inches (60 cm) per year.
For this reason, the Leyland cypress is best grown in a garden or lawn with plenty of space to stretch out.
Its fast-growing nature can easily make this tree a nuisance, so be aware of its growing potential before considering growing it in your garden.
Many people grow x Cupressocyparis leylandii, as barrier plants because of their bushy and evergreen nature.
They are also popular on Christmas tree plantations and carries attractive but small spherical cones.
The Leyland cypress can thrive in a range of soil types, but ideally, one should grow it in well-drained soil.
It grows best with full sun, as it needs at least six hours of direct sunlight each day.
Ideally water a young Leyland Cypress twice a week in the spring and summer, and twice a month in the fall and winter.
As it matures, one should set lawn sprinklers to water it sparsely: only once every couple of weeks in the spring and summer, and once a month in the fall and winter.
Trim Leyland cypresses annually to preserve the desired shape. If left untrimmed, Leyland cypresses will naturally take on a pyramid-like form.
They can be trimmed into a hedging plant, ideally prune young shoots three times per year when growing. Do not trim older material as it will not regrow.