15-20 Days. Add new flavor to everyday salads! High in vitamin C and potassium, arugula's peppery flavor is the perfect balance tossed simply with balsamic vinegar and Parmesan cheese. Arugula baby greens can be grown indoors at any time of year and are a nutrient-packed way to get your “green fix” in winter. Move containers as needed for best light exposure and temperature. Harvest when 2”‒4” tall and enjoy! Detailed sowing instructions, and Arugula and Walnut Pesto recipe inside packet.