Massive Haze Genotype: 85% Sativa Genetics: Haze x (Skunk x Northern Lights) Height: up to 4.5 m in open field Flowering: 65-75 days THC: 16-20% Yield: 1-1.3 kg/m2 indoors, the end of October outdoors Massive Haze is a stainless sativa with a strong psychoactive effect minus the feeling of sleepiness or tiredness.