Complete STS Kit - Create 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.

See the illustrated step-by-step mixing guide — ten picture steps covering mixing, the dilution chart, the spray schedule, storage and safety, plus printable PDFs.

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

You will need to supply: distilled water, three clean glass jars (one for each part, plus a third for mixing), a 50–100 mL syringe and a glass spray bottle.

Spraying. The effect is local — it only works where the spray lands. Treat the areas where buds would form, not the leaf surfaces, and soak those spots well each time.

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.