Cloning for Sex

Marijuana Horticulture

Determine plant sex accurately, 100 percent of the time, by “cloning for sex”. To clone for sex, take two cuttings (in case one dies) from each plant in question. Use waterproof labels and an indelible marker to identify sets of clones and corresponding parents.

Give rooting clones a 12-hour light/dark regimen. After a 12 hour day, set clones in a dark closet, or place a box over them. The dark period must be total and uninterrupted to induce flowering. Clones usually show sex within two weeks. Cull out all males except those used for breeding. Flower little females, and keep their mothers growing under 18-24 hours of light.

Growers with only one room root clones in a nursery flat, and cover it with a light-tight cardboard box for 12 hours every night. Remove the cardboard box after the lights go out to increase air circulation and ventilation.