Silver Thiosulfate
Silver thiosulfate (STS) is a chemical compound used in cannabis breeding to reverse sex expression in female plants, triggering male flower production without genetic modification. Breeders apply STS solutions to target branches or whole plants to generate feminized pollen, which when crossed with females produces all-female seed lines. This technique became widespread in cannabis horticulture during the 1980s–1990s as an alternative to colloidal silver. STS is valued for its efficacy and reduced plant toxicity compared to other reversal methods, though application timing and concentration critically affect results. The method is foundational to modern feminized seed production and remains standard in many breeding programs worldwide.
Silver Thiosulfate strains
No strains tagged into Silver Thiosulfate yet — they'll appear here as breeders submit lineage records under this family.
Silver thiosulfate (STS) is a chemical compound used in cannabis breeding to reverse sex expression in female plants, triggering male flower production without genetic modification. Breeders apply STS solutions to target branches or whole plants to generate feminized pollen, which when crossed with females produces all-female seed lines. This technique became widespread in cannabis horticulture during the 1980s–1990s as an alternative to colloidal silver. STS is valued for its efficacy and reduced plant toxicity compared to other reversal methods, though application timing and concentration critically affect results. The method is foundational to modern feminized seed production and remains standard in many breeding programs worldwide.
STS application is essential breeding infrastructure for creating feminized seed lines without genetic markers. Breeders use STS to generate reliable female pollen sources, enabling consistent all-female crosses and eliminating the need for male parent plants in stabilized lines.
Educational reference · Cultivar metadata only · No medical claims