Complete STS Kit - For Making Feminized Seeds

This kit contains the ingredients to make several batches of STS (Silver Thiosulfate Solution). The ingredients are unmixed so you can prepare fresh solution as needed.

View the complete STS mixing and application instructions, including the dilution chart, application schedule, storage and safety guidance, and a downloadable PDF.

Each kit contains:
2x – 0.25 g Silver Nitrate
2x – 2 g Sodium Thiosulfate Pentahydrate

You will need to supply: distilled water, two clean glass mixing containers, a 50–100 mL syringe and a glass spray bottle.

Handling and safety. For adult use in plant breeding only — not for human or animal consumption. Silver nitrate stains skin and surfaces: wear gloves and eye protection, mix in a well-ventilated area, and keep both parts and any mixed solution out of reach of children and pets. Store the unmixed parts cool, dry and out of direct light.