An autoflower plant also called an autoflowering plant, this type pf plant has a life cycle that does not depend on the shortening of the light period to induce flowering. An autoflower cannabis plant will automatically start to flower regardless of the amount of light it receives each day.
Autoflowers are often described in the following way: eg A 63 day strain. This is a autoflower strain that takes 63 days from seed to harvest. With auto strains you cannot increase the length of the vegetative period, but you know the full time it takes the plant to finish flowering. Autoflower cannabis is cannabis that does not use the length of light during the day as the basis to start flowering, instead auto flower plants start flowering automatically after 2-6 weeks.
Autoflower cannabis plants usually have a short life cycle, this ranges from 60 to 120 days or so depending on the strain. Auto flower plants are grown by people who life in areas where you have a short growing season eg warm weather only lasts 3 months such as Russia or northern Canada or Europe. In places like this you cannot grow normal photo sensitive plants as they would not be able to complete their flowering before it got to cold.
Also some people grow autoflowering strains as they can yield well and stay small in height which can make them a safer option when growing in your house or backyard. Auto flower cannabis plants generally grow between 2-4 ft high and yield half an ounce to 2 ounces per plant in 80-120 days. The autoflower genes come from Cannabis ruderalis which is thought to have originated from Mongolia through to northern Europe, these plants have been cross breed with other cannabis varieties to produce hybrids that have good potency, good yields and flower in short periods of time.