Just found this while googling :
Sativas are just about the opposite of Indicas. They are tall, thin plants, with much narrower leaves and grow a lighter green in color. They grow very quickly and can reach heights of 20 feet in a single season. They originally come from Colombia, Mexico, Thailand and Southeast Asia. Once flowering has begun, they can take anywhere from 10 to 16 weeks to fully mature. Flavors range from earthy to sweet and fruity. Sativa's higher THC than CBD equals cerebral, soaring type of high, more energetic which can stimulate brain activity and may produce hallucinations.
Sativa plants are taller, take longer to mature, have less chlorophyll and more accessory pigments (accessory pigments protect the plant from excessive sunlight). As Sativa strains have less chlorophyll than Indica they take longer to grow, mature, and require more light.
Sativa typically takes longer to germinate and flower also, and grows more gangly then Indica breeds.
Yield is usually lower than Indica, but is very potent. Thai Sativa grows taller and has a longer flowering period, so they are better suited for outdoors.
Indicas originally come from the hash producing countries of the world like Afghanistan, Morocco, and Tibet. They are short dense plants, with broad leaves and often grow a darker green. After flowering starts they will be mature in 6 to 8 weeks.
The buds will be thick and dense, with flavors and aromas ranging from pungent skunk to sweet and fruity. The smoke from an Indica is generally a body type stone, relaxing and laid back. Indica's higher CBD than THC equals a much heavier, sleepy type of high. Indica plants have a heavy, stony high that is relaxing and can help different medical problems.
Indica yield is usually higher than Sativa, and shorter growing season. Better for indoor growing, because they don't get as tall.
Indica plants are short, bushy, mature early, have more chlorophyll and less accessory pigments (accessory pigments protect the plant from excessive sunlight). As Indica strains have more chlorophyll than sativa they grow and mature faster.
Combining different indicas, different sativas or a combination thereof creates hybrids. The resulting hybrid strains will grow, mature and smoke in relationship to the indica/sativa percentages they end up containing.
