Arugula can be cultivated early - as soon as the soil can be used -, until the end of September. Water the soil before sowing and add a few seeds every other week to always have some fresh arugula close at hand. The seeds need nutrition-rich and well-drained soil that stays moist at all times. To make sure the soil stays moist, cover it with a fibre cloth. After approximately 3-5 weeks, your plant is ready to be harvested.