Sativa. Sativa strains are characterised by their tall, rangy plant structure and their long-finger like fan leaves. Sativa strains have been known to reach the soaring heights of 25ft (7.5m) when grown outdoors however they generally grow to around 8ft (2.5m) as a norm.ativa strains take slightly longer to mature than indica strains and produce higher levels of THC and lower levels of CBD. This provides growers with a different option in terms of taste and high with sativa weed providing an uplifting, energetic, often cerebral high.