Essentials to the plants, micro nutrients are those elements which you find in very small quantities of the dry matter. As a comparison, yearly requirements in micro nutrients are expressed in grams whereas they would be expressed in kilos for macro nutrients.

Also called trace elements they are:

Boron (B)
Chlorine (Cl)
Cupper (Cu)
Iron (Fe)
Manganese (Mn)
Molybdenum (Mo)
Zinc (Zn)

Like macro nutrients, micro nutrients need to be added regularly to the soil. Micro nutrients can be added either as a raw element, Boron for instance, or as a secondary element as some of these elements can be found in compost or organic fertilizer as well as in manure.

Our organic fertilizer contain Copper and Zinc, particularly the brands Jack and Chai.