Let's talk leyland cypress...

I had trouble with them at my house in Thibodaux. Could have been not enough water or too hot when I planted. I planted about 15 of them. The ones that did survive barely grew. Maybe a foot or so in several years.

I planted 25 about 8 years ago here in middle Tennessee. I planted them about 8 feet apart and they were only 3 feet tall. Now 24 of them are still alive and about 25 feet tall. I’m a big fan of them.

I had 2 planted on either side of my driveway entrance and were growing well for 3 yrs before a type of caterpillar wiped them out.

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This cause two issues.

1) If there is a drought they dont get enough water

2) If there is too much water they get root rot that spreads to the one next to it.

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That's a big issue. diseases that get them are Seiridium Canker, Botryosphaeria Canker, and Cercospora Needle Blight are all common diseases that can affect foliage, stems, and branches. These are the common diseases that will cause branches or the whole tree to turn brown. There are also some root diseases such as Phytophthora root rot caused by Phytophthora cinnamomi, and Annosus root rot caused by Heterobasidion annosum. These diseases spread quickly from tree to tree and can eventually kill off your whole privacy screen. But they are also susceptible to environmental stresses such as heat/cold/dry/wet. AND....Its a big AND....they are short lived; 25 years max under ideal conditions.