Chemical Weathering. Chemical weathering takes place in almost all types of rocks. Smaller rocks are more susceptible, however, because they have a greater amount of surface area. Chemical reactions break down the bonds holding the rocks together, causing them to fall apart, forming smaller and smaller pieces.
Autos generally are ready to harvest sooner than photoperiod. Most autos are ready to harvest 65-90 days after being sprouted from seed. Some super autos have been bred to grow very big and can take up to 100 days before harvest.
Some auto-flowering cannabis strains are also fast to grow which makes a shorter wait for harvest time. This means you can be harvesting your crop in as little as two months after germinating the seeds. Outdoors, this means you can plant and harvest two or three crops in a summer growing season.