Above all we use a mix of copper and sulfer based products to minimize the necessary dose. The nettle mixture is a stimulant of vegetative growth. It is also resistant to mildew and helps control anthropods. The best time to harvest it is at the beginnng of its flowering, but we always have nettles on reserve, used regularly. It gives us fresh nettles during the whole season. 1 kg of fresh nettles for 5 liters of water, boil and leave to infuse for 10 to 20 minutes, dilute until you have 40 liters of product to pulverise per hectare.