I live in zone 10a. A year ago, I bought a kumquat tree from Costco. I planted it in my front yard. A month or so after I planted it, the leaves started to curl and/or turn yellow. The tree gets adequate sun and I water it. I tried citrus tree solid fertilizer and then citrus liquid fertilizer when the solid failed. I don’t know what’s wrong with my tree. Is it diseased? Help???
