I bought a bottle of organic fertilizer which is in liquid form. The instructions are in German but the merchant here labeled it as "organic fertilizer for fruit" so I just bought it.
Now I found out that it is specifically for citrus plants. I wonder if it is still suitable for my chili pepper.
NPK-fertilizer 7+3+6 + trace elements
Mediterranean plants have a special nutrient demand. This liquid fertilizer covers this need and is recommended for all kinds of citrus plants. The trace elements support the development of blossoms and fruits, the added iron acts preventively against chlorosis.