Feminization is the method to ensure that marijuana seeds are guaranteed to be female which is the sex of the plant that produces bud which naturally contains more Tetrahydrocannabinol (THC) than male plants.
Male marijuana plants will naturally fertilize the female but can significantly reduce your harvest by resulting in almost 70% male plants aside from the male plants having lesser THC. This will also accidentally fertilize the female plants which will greatly reduce their production resin that contains THC. Only the unfertilized flowers contain the most THC in a marijuana plant.
Here are the best ways to feminize Marijuana seeds which will inevitably ensure increase harvest when done properly. All of these methods will produce feminized seeds within 3-6 weeks.
The Silver Thiosulfate Method
Silver Thiosulfate Solution method or STS is one of the most common methods of feminizing marijuana seeds.
The Silver Thiosulfate method is done by preparing a solution made by combining two water solutions, one containing silver nitrate and the other containing sodium thiosulfate. To make a 0.02% silver nitrate solution, add 0.1 gram of silver nitrate in 0.5 liters of distilled water. Add 2.5 Grams of Sodium Thiosulfate Anhydrous or 3.9 grams of Sodium Thiosulfate Pentahydrate to 0.5 liters of distilled water. By mixing these two solutions, you will get a silver thiosulfate solution. Separately, these two chemicals could last up to 6 months but once mixed, the solution will only last for a month.
Silver thiosulfate could also be purchased as salt in granular form which could be dissolved in water. It is important that the solution is diluted into the distilled water properly, otherwise, it will burn the plants. If plants show any sign of burning, further dilution must be done. Keep the solution off your skin and always wear protective gear such as gloves, masks, and goggles. Although not known for toxicity, Silver Thiosulfate is an irritant.
Apply the Silver Thiosulfate solution by spraying it on the marijuana plant once every five days for thirty days. Saturate the area between the main stem and the branches which are called nodes with. Do not spray the roots.
Spray STS to the plant only after turning off the lights and run the lights in a 12-hour flowering cycle. Silver Thiosulfate is very sensitive to light so be careful of light leaks after spraying the plants. Light leaks are known to cause plants to have hermaphrodite traits or having male and female traits that would definitely pass on to the next generation of marijuana plants.
This solution will result in hormonal response to stress found in the marijuana plant which will trigger a gender change. Silver Thiosulfate stops the production of ethylene and male flower growth will become apparent in a couple of weeks and ripen a few weeks later. Reversing a female plant with STS will produce stable feminized pollen. The leaves will droop for a day or more after spraying but will soon resume turgidity during the process.
Spray only one plant from the bunch of the same strain and batch after isolating it from the rest. Allow the plant to dry during the gender change process. If the pollen sacs become visible carefully return it to the same batch where it came from where while making sure that it is set amidst the other female plants. Having it in their midst will pollinate the female plants around it.
The Colloidal Silver Method
The colloidal silver method also incorporates spraying the marijuana plant with a chemical solution. For this method, you will need a very small amount of colloidal silver or simply pure silver in distilled water. Colloidal silver solution is also available for purchase online.
You may create your own colloidal silver solution yourself. You will need a 9-volt battery, a connector, 2 alligator clips, a silver coin or jewelry and a tub of distilled water.
You need to connect 2 alligator clips to a 9-volt battery through a connector in its each of its red and black wires. Connect the alligator clips to a silver coin or jewelry and let the silver touch the distilled water but not the alligator clips. This will cause the silver ions to float on the distilled water. It is advised to leave this for seven hours, no more no less, or there will be much less ion or too much particle buildup in your water. Some growers even claim that the colloidal silver solutions prepared this way is more potent than the commercial variety.
Once ready, apply this mixture by spray onto the female plants while they are flowering. Spray them every day, once or twice, which will take less than two weeks or 10-18 days, depending on the different varieties of plants and their growing conditions.
The silver ion inhibits the ethylene production needed by the plant to produce female flowers just like the silver thiosulfate method. This process will force the plants to form pollen sacs instead which are seen in male plants. This pollen contains female genetic material making it highly probable that the seed the plant produces will be female.
Because female plants have zero male chromosomes, the pollen produced is female. After all these, you may proceed to normally fertilize your plant. Once male sacs developed, it will take some time for it to open and produce yellowish pollen which will take 2-3 weeks. You may manually harvest the pollen from sacs that do not open naturally by breaking it open and collecting it for pollinating the female plants or for storage.
It is important to note however to not consume any part of the plant that was sprayed with the colloidal silver solution.
The Rodelization Method
The third method, the Rodelization method involves the natural response of female plants when they are under stress. Female plants experience stress, by being unable to sustain life by being pulled off the roots and not having enough water or sunlight. Rodelization is a totally natural process of feminizing marijuana seeds without the use of chemicals but could be quite risky of not entirely pollination the female plants. But despite the risk of some seeds not really getting feminized, this method is preferred by organic growers who wish to naturally feminize their seed without chemicals.
The goal of Rodelization is to make the flowering plant remain in its flowering phase longer than the normal. In Rodelization, the plant is allowed to grow 10-14 days more, way past their harvest date.
This stress will trigger a biological response that will make the female plant grow pollen sacs even without any male fertilization in order to continue their breed. Because of this, there is a higher probability that the seed produced is female. This literal ‘panic mode’ makes the plant enter self-pollination mode.
The flowers are hanged to dry and are being carefully being taken off the drying lines to remove male bananas. Once the male bananas or pollen sacs emerge, you can harvest it naturally and choose which bud and cola that you wish to glaze with this pollen. These male bananas could also be kept in a sealed bag and may remain potent for two months when kept in a fridge.
Rodelization requires another batch of younger and unpollinated female marijuana plants that are two and a half weeks into flowering. This batch will be pollinated by the male bananas you previously collected. You may pollinate your plants by simply turning the fans on to high mode in order for the pollen to fly around your greenhouse just like nature does.
In order to maximize yield using any feminization method, one must make sure of the following:
- Select the best looking female plant for this process to ensure premium genetics.
- Make sure to separate and isolate the plant once sacs are formed away from flowering plants in order to avoid accidental pollination.
- Be ready to pollinate any flowering female plant with the feminized pollen once these pollens are developed. You may tap the sacs using smooth surface such as aluminum foil, parchment paper or even a Q-tip in order to expedite the collection of pollen. You may use this pollen right away to pollinate your flowers or keep it in a container inside a freezer.
- Be careful in handling chemicals.
- Be aware of every factor that will affect your marijuana plants such as lighting, ventilation, unplanned pollination, and others in order to secure a good harvest.
- Great care must be taken by choosing the marijuana plants wisely. Female plants should be taken from a single cannabis strain that is almost mature. Avoid any plant that has hermaphrodite traits.