Leyland cypress trees add interest and purpose to many landscape designs. Planted in numbers, these trees make nice screens and windbreaks along property lines. As individual plantings, Leyland cypress provides an attractive, oval-shaped tree of approximately 40 feet in height. This tree produces shallow root systems and feathery foliage on flattened branches. These trees occasionally suffer from disorders requiring special care. Recognize problems in your cypress trees and correct them to ensure healthy specimens in your yard or landscape.
Water your Leyland cypress correctly to revive problems caused by too much or too little water. Water about every two weeks to ensure adequate levels of moisture. Apply enough water during these sessions to dampen the soil near the trees' roots. Place a garden hose a small distance away from the trunk of the tree, and allow the water to run slowly, avoiding runoff. Check for adequate soil moisture by digging a small hole about 2 or 3 feet deep. Moisture at this level indicates sufficient moisture after watering. Your existing soil determines the amount of water required. Clay soil requires more time to soak the roots, while sandy soil quickly absorbs surface water. Soil that dries quickly requires more frequent watering.
Fertilize your trees to ensure adequate amounts of necessary nutrients. Test the soil near your Leyland cypress tree to determine nutrient deficiencies. Purchase a soil test from your local gardening center or landscape store, and follow the instructions for collecting your soil sample. Add any recommended nutrients to your existing soil to eliminate soil deficiencies. Soils with high pH levels cause yellowing branches. Acidify these alkaline soils with an application of iron chelate. Apply fertilizers and soil amendments according to the package instructions. Provide adequate nutrients to help your tree resist damage from pests and diseases.
Cut off any damaged or dead branches. Remove diseased limbs to avoid the spread of canker and fungus. Use a branch saw or sturdy pruning shears to remove these segments. Cut into the living section of each branch in order to remove the entire effected area. Avoid spreading disease by cleaning your pruning shears or saw between cuttings. Wipe down your tools with rubbing alcohol after cutting through diseased growth.