@Xeramtheum - The site you showed me mentions to water the Leyland once per week, as I live in 6b or 7a USDA zone. And it says to use that fertilizer once per year. Is there such thing as overfeeding or overwatering these plants?
I just bought a drip line kit and will put them all on it. I will automate the system so that I don't have to be mindful (I can be forgetful). But how much should I water them? (Gallons and frequency?) I don't want to cause them any adverse effects. I have a well, so water restrictions aren't a thing, and I will water at night so as to avoid evaporation.