Canton Pak Choi, also known as Bok Choy or Chinese Cabbage, is a popular and nutritious leafy green. These seeds, scientifically known as Brassica rapa var. chinensis, produce plants with green leaves and white flowers. They are perfect for planting outdoors after the last frost or indoors a few weeks before. With a harvest time of 70 days, this biennial plant reaches a height of 6 to 18 inches and should be spaced 18 to 24 inches apart. It thrives in full sun and prefers average soil moisture. Each pack contains 1500 seeds.