Large Silver Thiosulfate Spray (STS) Spray Kit – 8 oz / 250 ml

Cannabinology STS Kits are easy to use, highly effective, and very reliable. Our proprietary formula provides extended shelf life of at least a year from the day you purchase it. Just add distilled water and you are ready to begin! 

This Large STS Spray Kit contains enough Silver Thiosulfate (STS) to make 8 oz or about 250 milliliters of STS spray. Enough STS spray to sex reverse many small or medium plant or 1 large plant and perfect to make many thousands of feminized seeds!

Just add water to the STS solution in the STS spray bottle and you're ready to begin!

Included in this 8 oz Silver Thiosulfate Spray (STS) Spray Kit:

STS Spray bottle with Concentrated STS

Detailed STS Spray Kit instructions

What is Cannabinology STS Spray Kit?

The Cannabinology STS Spray Kit is designed with the grower in mind. The kit contains everything you need to sex reverse female plants and produce feminized seeds at home or in a commercial setting. Our proprietary Silver Thiosulfate formula provides the extended shelf life of a 2 part STS kit with the ease of use, accuracy, and repeatability of a premixed STS spray.

Wait, what is STS?

STS stands for Silver Thiosulfate, a compound produced by a chemical reaction between Silver Nitrate and Sodium Thiosulfate. When applied to plants, Silver Thiosulfate (STS) acts as an ethylene blocker. Ethylene can be considered the female hormone in plants. By preventing the action of ethylene you can force a female 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.

How does 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.

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 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. 

How to Make STS:

The Cannabinology STS Spray has been formulated over years of research to be the easiest Silver Thiosulfate (STS) spray on the market while maintaining significant shelf life. Most Silver Thiosulfate sprays come in 2 parts to prevent the solution from expiring, but this also increases the opportunity for human error, especially for newer breeders. Other sprays come ready to spray right out of the box which unfortunately decreases the shelf life of Silver Thiosulfate solutions.

Our Silver Thiosulfate (STS) spray is designed to prevent human error while maintaining the integrity of the Silver Thiosulfate (STS) compound. All you need to do is add water and a touch of soap to the Cannabinology Silver Thiosulfate (STS) spray bottle and you’re ready to begin!

How to Use STS:

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