BlackJack FAST Version Feminised Seeds. This is from the Sweet Seeds. A very easy to grow and grows well in S.A.D. Auto x Jack Herer Flowering time takes 49 – 56 days. Flowering yield Indoors: 500-600 gr/m2 & Outdoors: 500-700 gr/plant and yet produces a wonderful plant height of Tall. This strain produces an effect of Powerful.