Goji berry fertilizer? Soil PH?
I have a few Goji berry plants which are 3 to 4 years old. But they don't grow and produce very much. Their leave are not shiny green-more like a dull green.
I have clay soil and the PH value is around 6.5 to 7.
Should I raise the soil PH?
And what kind of fertilizer I should use?