Silver Thiosulfate Kits
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What is the Cannabinology STS
Spray Kit?

​The Cannabinology Silver Thiosulfate Spray Kit was designed with the grower in mind. These kits contains everything you need to sex reverse female cannabis plants and produce feminized seeds at home or in a commercial setting.


We offer a range of sizes from a small home STS spray kit to larger commercial STS spray kits. The small Home STS Spray Kit contains enough Silver Thiosulfate (STS) spray to sex reverse 1 small plant; perfect to make a few hundred or even a few thousand seeds as a home grower! The commercial STS Spray Kit can produce many small sex reversed plants or 1 large sex reversed plant to produce many thousands of seeds.

What is Silver
Thiosulfate (STS)?

STS stands for Silver Thiosulfate. When applied to plants such as Cannabis sativa, Silver Thiosulfate (STS) acts as an ethylene blocker. Ethylene can be considered the “female” hormone in Cannabis plants. By preventing the action of ethylene you can force a female Cannabis plant to develop and produce male-type flowers, pollen sacks, and pollen. Since this pollen was made by a female, the pollen can be used to pollinate another female plant creating feminized seeds which will be 100% female.

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A sex reversed cannabis plant using Cannabinology STS Spray (Silver Thiosulfate) for making feminized seeds
How does Silver Thiosulfate (STS) work?

STS is a compound that blocks the action of ethylene, the "female hormone" in many species of plants. When you apply the Silver Thiosulfate (STS) spray, the plants absorb the compound through their leaves or flowers where it blocks the action of ethylene. This causes the plant to grow and develop as if it were male. As the flowers develop, a plant treated with Silver Thiosulfate (STS) will develop male type flowers, pollen sacks and pollen rather than calyxes and pistils. The pollen that is released will carry only the genes for female plants.

How do I prepare Silver Thiosulfate (STS) spray?

Our Silver Thiosulfate (STS) spray is easy to prepare, has extended shelf life, and provides consistent repeatable results. All you need to do is add water and a few drops of soap to the Cannabinology Silver Thiosulfate (STS) spray bottle and you’re ready to begin!

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How do I use Silver Thiosulfate (STS) spray?

Here is a brief overview of the steps to use Silver Thiosulfate (STS) spray to sex reverse female cannabis plants.


Step 1: Add water then a small amount of soap to the Silver Thiosulfate (STS) Spray bottle.


Step 2: Apply Silver Thiosulfate (STS) Spray to female plants beginning on day 1 of flower. Repeat the Silver Thiosulfate (STS) spray every 5 days until day 20 – 30 depending on the variety.


Step 3: Pollinate non-sex reversed female.


For more detailed information and tips on using Silver Thiosulfate (STS) more effectively see the instructions included in the Cannabinology STS Spray Kits

Does using Silver Thiosulfate (STS) spray cause hermaphrodites?

The short answer is no.

The long answer is, it depends on the genetics of the seed mother and the pollen donor. Female cannabis plants sprayed with STS remain genetically female and don't take on any extra hermaphroditic traits from being sprayed with Silver Thiosulfate (STS) spray, but if either of the parents have hermaphroditic traits then it is possible to have hermaphrodites in the offspring. The chance of hermaphrodites is also increased if you are selfing, using the same plant or the same cut as both the seed mother and the pollen donor. Regardless, the hermaphroditic traits come from the genetics of the parents not the process of sex reversing using Silver Thiosulfate (STS) spray.

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