|Generally speaking the lighter the color of the plant, the less THC it contains. And the more CBD is in the trichrome stalk, meaning the more "down" the high. This is typical of most indica; couch lock, narcotic etc.
You don't want to exceed 8-9 weeks flowering as this will increase THC and reduce CBD: as the phenols and terpenes progress from the base to the stalk of the trichrome, CBD is bio-synthesized into THC. As time passes, THC increases as CBD decreases, which is not what you want to do with an indica. Indicas reach maturity quicker than sativas. Less THC, more CBD. The greater the ratio of CBD to THC means it is more indica oriented.
As time goes on, and flowering reaches the 10-16 week period, THC increases as CBD decreases (as it is being bio-synthesized into THC). The greater the ratio of THC to CBD = sativa. Sativas take longer to mature, generally 10-16 weeks, more time is used to build up THC producing a more cerebral, "trippy" UP high.
Most indica varieties originate from South-East Asia and the Indian subcontinent. These indica varieties are plants that have dense, compact buds. The flowering period is generally shorter, usually between 6 to 9 weeks. Effect of an Indica is usually a body stoned sensation. More of a physical experience and can make you sleepy. 100% Indicas are Afghan (bronze), Polm Gold (bronze) and Afghani Gold female.
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 heavy, sleepy high is relaxing and can help different medical problems. Indica yield is usually higher than Sativa, and has a shorter growing season. They are better for indoor growing because they don't get as tall. Indica plants are short, bushy, mature early, and 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.
Sativas can be found round the equator. Sativas are usually larger plants and often don't smell as much as indicas. Sativas keep growing during the flowering period, which usually lasts 9 to 12 weeks. The effect is more of a 'high', which is usually energetic and cerebral high. 100% Sativas are Royal Thai (bronze), Citral Sativa (bronze)
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, resulting in a more energetic soaring type of high, which can stimulate brain activity and may produce hallucinations. Sativa plants have less chlorophyll and more accessory pigments, protecting 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, and grows taller and ganglier than Indica breeds. The 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.