Stephen T Villanyi
Hello. We have several large Leyland Cypress next to our patio. They have steadily overgrown the patio. Ideally, I would like to have them pruned by 50 % horizontally and then probably 50% vertically to minimize the risk of getting blown over by the wind. Is this wise? If so, is this a good time to do this? I once heard about some fungus attacking open cuts on the Cypress. Thank you. Any advice would be appreciated.
The above trees sound like they are planted in the wrong space. Leyland cypress can grow to about 60 feet. They can be pruned to maintain a hedge but this is generally done when they are young. At this point, the severe pruning that you mention would really be too much. The plants would look like sticks and end up being an eyesore. Stressing the trees makes them susceptible to canker diseases.
It is recommended to replace with plants that will grow to the mature height and width for the space.