We add our own starter fertiliser to Kekkilä Professional substrates to secure the basic nutrient levels. It is very important to compensate the nutrients that plants take from the substrate. The plants’ needs vary depending on plant type and species, pot size, irrigation and local conditions such as season and climate.

Plants require nitrogen, phosphorus, potassium, calcium, magnesium and sulphur in greater quantities, hence they are called macronutrients. The ones called micronutrients – iron, boron, manganese, zinc, copper and molybdenum – are required in smaller quantities but are essential for plant growth.