--- product_id: 395679806 title: "Feminized Seed Spray | 8 oz/240 ml Bottle | Breed 100% Female Seeds (Feminized Seeds) | Silver Thiosulfate Spray Kit | STS Spray Kit | Reversal Spray (8 oz - with Spray Bottle)" brand: "cannabinology" price: "€ 74.91" currency: EUR in_stock: true reviews_count: 8 category: "Cannabinology" url: https://www.desertcart.fr/products/395679806-feminized-seed-spray-8-oz-240-ml-bottle-breed-100 store_origin: FR region: France --- # 100% feminized seed production 8 oz / 240 ml precise volume Proprietary Silver Thiosulfate formula Feminized Seed Spray | 8 oz/240 ml Bottle | Breed 100% Female Seeds (Feminized Seeds) | Silver Thiosulfate Spray Kit | STS Spray Kit | Reversal Spray (8 oz - with Spray Bottle) **Brand:** cannabinology **Price:** € 74.91 **Availability:** ✅ In Stock ## Summary > 🌿 Reverse the rules, breed like a boss! ## Quick Answers - **What is this?** Feminized Seed Spray | 8 oz/240 ml Bottle | Breed 100% Female Seeds (Feminized Seeds) | Silver Thiosulfate Spray Kit | STS Spray Kit | Reversal Spray (8 oz - with Spray Bottle) by cannabinology - **How much does it cost?** € 74.91 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/395679806-feminized-seed-spray-8-oz-240-ml-bottle-breed-100) ## Best For - cannabinology enthusiasts ## Why This Product - Trusted cannabinology brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unlock Rare Genetics:** Save and propagate your favorite phenotypes with ease and accuracy. - • **Ideal for All Breeders:** Perfect for beginners and pros aiming to create thousands of feminized seeds. - • **Precision Application Kit:** Complete spray bottle kit designed for easy, repeatable use from day 1 to 30 of flowering. - • **Effortless 100% Female Seeds:** Harness the power of STS to guarantee pure female genetics every time. - • **Scientifically Proven & Safe:** Non-toxic, non-allergenic formula trusted by breeders worldwide. ## Overview The Cannabinology Feminized Seed Spray Kit is a scientifically formulated Silver Thiosulfate (STS) solution designed to reverse female cannabis plants to produce 100% feminized seeds. This 8 oz (240 ml) kit includes everything needed for precise, safe, and repeatable application, enabling breeders to save favorite genetics and create high-quality feminized seeds efficiently at home or commercially. ## Description Cannabinology Feminized Seed Spray is an easy to use Silver Thiosulfate Spray Kit to make feminized seeds. This 8 oz / 240 ml STS based Feminized Seed 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! Review: Works great, make hundreds of seeds. - This stuff is great, first time trying, i got a ton of pollen off the clone i sprayed with the spray. It made about 300 seeds on other clones. i dunno what the other users are complaining about, they mustve done something wrong because this definitely works 100% Review: Awesome product! - Works great! First time trying a reversal, followed the instructions, and I had great results! ## Features - EASILY MAKE 100% FEMALE SEEDS: The Cannabinology STS Spray Kit is easier to use and more effective than Colloidal silver and other reversal methods. This kit contains everything you need to sex reverse female plants and produce feminized seeds at home or in a commercial setting. This proprietary Silver Thiosulfate formula is proven to provide ease of use, accuracy, and repeatability to breeders across the country and around the world. Start your breeding journey today! - SAFE & SCIENTIFIC: Cannabinology STS Spray is safe, non-toxic, and non-allergenic. However, a plant that is treated with STS should not be consumed (it will be covered in pollen sacs anyway) and it can stain fabrics. It’s always a good idea cover up and wear gloves when doing scientific work! - HOW IT WORKS: The Cannabinology STS Spray Kit contains a proprietary aqueous formula of Silver Thiosulfate (STS). When applied to plants at, Silver Thiosulfate (STS) blocks the action of ethylene, the “female” hormone in plants. Blocking ethylene forces a female plant to produce male-type flowers, pollen sacks, and pollen. Since this pollen was made by a female, the pollen can be used to pollinate a non-treated female plant (or branch) creating feminized seeds which will be 100% female. - HOW TO USE: Whether you’re just starting your breeding journey or are a seasoned breeder Cannabinology STS Spray Kits make it easy to make feminized seeds. Add water then a small amount of soap to the STS Spray bottle. Apply STS Spray to a female plant starting on day 1 of flower; repeat every 5 days until day 20 – 30. Pollinate a non-treated female plant. Grow the female plant until seeds are mature. For important tips on using Cannabinology STS Kits, see the included instructions. - BENEFITS: Cannabinology STS Spray Kits provide new and seasoned breeders the easiest method of reversing female plants and producing feminized seeds. You can easily save your favorite phenotypes, produce new feminized crosses, and even flush out rare genotypic or phenotypic traits. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09NF4G57W | | Best Sellers Rank | #60,732 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #314 in Lawn & Garden Sprayers | | Customer Reviews | 4.0 4.0 out of 5 stars (127) | | Item model number | STS8 | | Manufacturer | CBGYscientific | | Product Dimensions | 4 x 3 x 6 inches | ## Images ![Feminized Seed Spray | 8 oz/240 ml Bottle | Breed 100% Female Seeds (Feminized Seeds) | Silver Thiosulfate Spray Kit | STS Spray Kit | Reversal Spray (8 oz - with Spray Bottle) - Image 1](https://m.media-amazon.com/images/I/61wiabPw7jL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great, make hundreds of seeds. *by E***D on January 29, 2026* This stuff is great, first time trying, i got a ton of pollen off the clone i sprayed with the spray. It made about 300 seeds on other clones. i dunno what the other users are complaining about, they mustve done something wrong because this definitely works 100% ### ⭐⭐⭐⭐⭐ Awesome product! *by I***N on February 7, 2026* Works great! First time trying a reversal, followed the instructions, and I had great results! ### ⭐ Ineffective *by T***P on October 31, 2025* Doesn’t work well. I bought a couple of the 8 oz ready to make bottles that worked. Then I bought a refill concentrate that straight up didn’t work at all, so I bought 2 more of the 8 oz ready to make AGAIN instead of the concentrate and they did not work either!!! Total waste of money, I can say that I previously had success but not anymore!!! ## Frequently Bought Together - Cannabinology Feminized Seed Spray | 8 oz/240 ml Bottle | Breed 100% Female Seeds (Feminized Seeds) | Silver Thiosulfate Spray Kit | STS Spray Kit | Reversal Spray (8 oz - with Spray Bottle) - Plant Feminizing Spray, 3 oz Triple Pack - HydroDynamics Clonex Rooting Compound, 100 ml --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.fr/products/395679806-feminized-seed-spray-8-oz-240-ml-bottle-breed-100](https://www.desertcart.fr/products/395679806-feminized-seed-spray-8-oz-240-ml-bottle-breed-100) --- *Product available on Desertcart France* *Store origin: FR* *Last updated: 2026-04-24*