Zkittlez Glue Feminised Seeds from Expert Seeds. This is from the Zkittlez x Gorilla Glue #4. A very easy to grow and grows well in Greenhouse, Indoor, and Outdoor. Flowering time takes 53 – 60 days. Flowering yield takes Indoors: 350 gr/m2; Outdoors: 450 gr/plant and yet produces a wonderful plant height of 80 – 100 cm. This strain produces an effect of Powerful, Uplifting.