How long does it take to grow a plant? May 29, 2020 01:17 Updated Seeds normally take 3-4 months to grow. Clones normally take 2-3 months to grow. Have a specific strain of plant in mind? Check out our app to see detailed grow times for hundreds of plants! Related articles Ideal temperature and humidity for growing How many harvests can I get out of a Grobo? What if my plant is too tall? When do my lights flip to 12/12 flowering mode? How do I harvest cannabis?