Answer: There is always a balance to be struck between quick coverage and mature size of the plants since you do not want them to become overly crowded. While relatively quick growing in juniper terms, it will take years for this plant to fill in. I would look for average growth roughly in the one foot a year range (or less) once established and I would not put them closer than six feet apart on center to allow for the long term. On a slope it is a good idea to use staggered rows so that the plants are evenly spaced but do not encourage runoff to travel straight down the hill. Terracing is also something to consider on a slope that steep. Good luck with your junipers.
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