Older foliage on Junipers will sometimes turn brown however, this Juniper
doesn't look that old and appears to be very healthy. It is not turning
that dull green/gray color that Junipers will turn when they are dying.
This Juniper seems to be pretty dense which may be shading some of the
foliage from the sun which will cause dye back on some of the foliage
underneath. Are the rocks etc. glued in? If so you will probably need to
remove all of that glued stuff and replace with some loose covering
similar to what is on top of it now. If the pot has regular potting soil
in it you may want to repot with a bonsai soil that is more porous. All
of this will make watering easier. Also Kevins advice on watering is good
plus it sounds like you may be overwatering the tree.

Bill Watkins

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