65 to 75 Days to maturity. Brassica juncea. Da Ping Pu Mustard Seed. Non-GMO, open-pollinated heirloom. This is a delicious wide-leafed bunching mustard. It's grown extensively in Asia and has been made available in the United States in recent years. It’s often referred to as a “big head” type of mustard. This one does best as a fall crop. It needs some warmth to germinate and as a young plant. With time it grows in its sensitivity to heat. Does best in the cooler temperatures of fall as it matures and gets close to harvesting. Approx 11,500 seeds / oz.