The period of growing stevia from sowing to harvesting is about 16-18 weeks. The crop has to be harvested when stevia begins to flourish. Exactly in this period the maximum quantity of steviosides is accumulated in the stevia leaves. In the homeland of stevia, Paraguay, flowering occurs in the period from January to March, and in the conditions of the north latitude and temperate zone (which also includes Europe) it occurs in the period from July to September. Duration of the day also has an effect over plant growing and development. The short day is favorable to flowering and seed formation. The longer day contributes to formation of branches and leaves and respectively increases the accumulation of steviosides. Under optimum conditions and good farming practices from one square meter of stevia plants, seven kilograms of sugar can be gathered. Stevia harvesting is really simple. The stems are cut at a height of 5-6 cm above the ground and are died in a light and airy room.