cold resistant, bolting resistant, early muturity Early maturity,harvest about 50 days after transplanting ,late bolting ,high quality ,round head ,about 1.0 -1.2 kg weight,suitful for spring cultivate in north. If you are interested in our seeds , please do not feel hesitate to contact me.Trade no. : cnddsynyTel: 86-415-2523637 86-131-3054-6707