Basically, all vegetative plants will have revealed their sex by about the 6th week from seed. Repeated colloidal silver treatments cause repression of the plant’s ethylene, which is the stuff that creates male flowers. Instead, the treated female plant will grow pollen sacks full of FEMALE pollen . Then breeders use the female pollen to pollinate female flowers, resulting in the development of all-female seeds. Female marijuana plants take a bit longer than males to show their first signs after being changed over to flowering.

What you’re looking for is “Pre-flowers.” These are tiny versions of adult sex parts, and when you see them you can tell what gender the plant is going to be. They usually show up in the upper parts of the plant, closer to the lights. But that’s not the only way to figure out the sex of your plants. Vegetating plants usually reveal their gender when they’re just 3-6 weeks old from seed, but you have to know where to look. What are cannabis “pre-flowers?” They are little versions of adult flowers that appear on your plants and can help you figure out the plant gender as soon as possible. But again…The rest of the plants went in flowering stage weeks after the mystery seed started to flower.

Male pre-flowers tend to have a “spade” shape, like the spades from a deck of cards. Male cannabis plants often reveal their gender sooner than female plants. Once they’ve shown hermaphrodite preflowers, they won’t turn into female plants.

You also will waste time and energy growing plants only to find out that some or all are male and have to throw them away. If you want to be more proactive and get rid of all male plants right away, then use this technique. Marijuana plants have an internal process where they can detect how long they scam receive uninterrupted darkness each day. In the wild, as the days get shorter and nights get longer, the marijuana plant “realizes” that winter is coming and will start budding/flowering as it approaches the end of it’s life cycle. However, seeds do give away some indications regarding their quality.

You’ll have to spot male plants, but the payoff will be more than worth it. Male pre-flowers tend to have a spade shape, like the spades from a deck of playing cards. Male cannabis plants often reveal their sex sooner than female plants. Male pre-flowers tend to be shaped somewhat like a spade This male plant was only 3 weeks when it made its first pre-flower.

Only a female marijuana plant makes flowers/buds that contain a usable amount of THC. Male marijuana plants only make pollen sacs that they use to fertilize the females. Most growers will throw away any male plants that they encounter to keep them from fertilizing the female plants. If your female plants do get fertilized, they will use all their energy to produce seeds instead of making buds. This is good if you want seeds, but you will run into the same problem since half of the seeds will also be male.