There are many types of cypress trees. In fact, the Cypress family has more than 140 species. Common cypress trees include the Italian cypress, Leyland cypress, bald cypress and the Hinoki cypress. Though all trees grow best outdoors, you can grow these trees indoors with the right environment and care.
All cypress trees require full sunlight for best growth. However, these trees will adapt to some partial shade with the right care. Place an indoor cypress tree in a bright, sunny location that receives about six to eight hours of full, daily sunlight. The location should be well-ventilated and away from locations with extreme temperature variations, such as heating vents and air conditioners. If placed in a window, the cypress needles must not touch the window pane as this may cause browning and dieback of those areas.
Cypress trees are intolerant to dry soils, especially in the potted environment. Water a potted cypress deeply and regularly to maintain a slightly moist soil environment. Cypress trees also benefit from regular misting, which promotes the desired humidity levels. Misting is especially important in the indoor environment since indoor air tends to be dry.
The indoor cypress tree should enjoy some outdoor time. The natural sunlight and air circulation of the outdoors promotes the cypress tree's healthy cell development and reduces the potential for disease. Always consider placing the indoor cypress tree outdoors during the growing season, from spring to fall.
The vigorously growing cypress tree can quickly grow out of its potting container. To control its size, prune and repot the cypress regularly. Hard prune the potted cypress during the early spring to remove any dead or damaged branches. Pinch the needles of the cypress during the growing season to reduce the density of the interior foliage. This will also promote the development of smaller, more compact needles. Repot a cypress bonsai every two to three years, during the early spring, just as the tree becomes root bound in its container.