Alien OG Marijuana Seeds is a strain with very high THC and is one of the easiest to grow. It comes with up 25% THC giving you a very relaxed and euphoric effect. This is a small plant at just 75 cm high but can produce average yields. Flowering times are just 8 to 10 weeks with buds oozing with earthy, pine, spicy, citrus, and sweet flavors.