Geography of spirulina
Spirulina grows best in hotter climates like the Tropics; the Equator can be too hot and spirulina performs best in highly alkaline environments (pH 10-12).
Spirulina naturally occurs in parts of Lake Chad, Africa, where locals would incorporate it in their diet.
There is a history of spirulina being cultivated by the Aztec’s and it is believed to be sold in markets alongside other vegetables and fruits.
In more recent times, spirulina can be found growing naturally or being cultivated in China, Thailand, India, Australia, New Zealand, USA, Chile, France and elsewhere in the world.