Leland cypress death.
A little over a year ago, I planted a row of 7 5-gallon trees next to one another, in order to act as a privacy fence. I planted them 3' apart. They've been growing well, until last month, when 2 of them died. These 2 are not next to each other, and have both turned brown and brittle.
 I've read somewhere that Lelands really can't stand hot weather, is that true? Summer here is in the high 90s with some days in the low 100s, hot and dry.
 Does the planting distance have anything to do with this?
 Once the branches and leaves turn brown and brittle, is this irreversible, as in 100% dead?
 Watering is 2-3 times a week.
I'm wondering why only 2 of them died.