In california its estimated that growing marijuana indoors uses the equivalent of 200 pounds of coal to grow just a single pound outdoor growing needs sun air water and minimal equipment for your plants to survive better quality buds marijuana that is grown outdoors carries a distinctive flavor and aroma. Trainwreck has been around for a minute now and it is one of the best and easiest strains for growing outside it easily grows well over 2 meters and has a very potent yield one plant can yield as much as 700 grams when grown outdoors it takes only about 8 or 9 weeks to flower and you can also train and top it to further increase its yield. Sunlight weed plants will need full direct sun for at least 6 hours a day you may have a backyard but it might not be great to grow there if it doesnt get full sun every day your cannabis . Harden off your marijuana plants if you start your plants inside in a grow room or on a windowsill harden them off before transplanting them to an outdoor location hardening off is a process in which plants gradually become acclimated to the outside environment over a period of seven to ten days