White Critical Express Feminised Seeds. This is from the Kalashnikov Seeds. A very easy to grow and grows well in White Widow x Critical Mass x Secret Hybrid Flowering time takes 45 – 48 days. Flowering yield Indoors: 450 – 600 gr/m2; Outdoors 600 – 900 gr/plant and yet produces a wonderful plant height of 80 – 120 cm. This strain produces an effect of Calming, Soothing.