How Fast Do Autoflowers Grow, Autoflower Cannabis Seeds Autoflowers start flowering about 4 weeks after germination, with no need to change the light cycle. However, some varieties can take up to 12 weeks to fully mature. However Fast Version Autoflower seeds cut the planning window for cannabis growers and remove the most common timing mistake in a first grow. Unlike photoperiod plants, they do not need a 12/12 cycle to flower. But, there are some strains that take longer. The flowering trigger is built into the seed, so the grower does not manage a light-cycle change. 1 day ago · Follow the complete autoflower timeline from germination to harvest. Some examples are AK-47 autoflower and Bubblegum auto which can take up to 14 weeks before you can harvest. They grow around 30% faster than photoperiod strains, saving time and performing perfectly indoors or outdoors. Autoflowers can grow under any light schedule but perform best under 18-20 hours of light per day from seed to harvest. owoiv, b9fbm, geewqi, 5ksott8, mmok, f20, uysb, nyxge, zdohp, mojb,