I know how fish emulsion works as a foliar spray on deciduous shrubs, but will it work on needle leaved evergreens such as mugho pines and junipers? If not, what should be used for comparable result?
Yes it does. Just add a small amount to water and do a light mist over the leaves when it is not sunny. If it is sunny your spray will cause black spots on the leaves. The result would be leaves that are a little bit larger.
Most foliar fertilizers should be rich in micronutrients, Nitrogen(N) and Phosphorus(K). Here is a powerpoint that explains how foliar feeding works
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