Ever wished you could guarantee every single seed you plant would grow into a female plant? For cannabis growers, this wish is a big deal. Why? Because only female plants produce the prized buds everyone wants. Buying regular seeds means you might end up with a bunch of male plants taking up valuable space and not giving you the harvest you hoped for. It’s frustrating when you invest time and money only to get the wrong outcome.
This is where Feminized Seed Sprays come into the picture. They promise to turn your male plants into females, offering a way to salvage a disappointing batch of seeds. But with different sprays available, how do you know which one truly works? Picking the wrong spray can waste even more time and effort. You need a spray that is effective and easy to use.
In this post, we will break down what Feminized Seed Sprays are all about. We will look at how they work, what to look for when buying one, and how to use them correctly for the best results. Get ready to learn the secrets to maximizing your female plant yield, no matter what seeds you start with.
Top Feminized Seed Spray Recommendations
- 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.
- 🌱 100% FEMINIZED SEEDS: Tiresias Mist is the most reliable, safe and effective alternative for producing feminized seeds. One bottle is all it takes to provide enough solution to one branch that will produce female pollen. Transfer that pollen to the flowers of a dioecious plant and it will produce 100% feminized seeds. No more guessing!
- 🌱SAFE + FUN: Tiresias Mist is made of natural minerals and is non-toxic, non-allergenic and will not cause harm to humans, plants or pets. However, the stem being treated should not be consumed (it will be covered with pollen sacs). Most importantly, have fun, get crazy and be excited to start your own experiments. You now have the ability and the freedom to produce your own female seeds and save your favorite strains!
- 🌱 HOW IT WORKS: Whether you’re an amateur or a pro grower, Tiresias Mist makes it simple for anyone to create their own feminized seeds. A 1oz bottle will treat one branch of a plant to produce feminized seeds on the same plant, or to produce genetically female crosses with other plants. Treating one branch enables that one branch to create male characteristics (pollen sacs) through which the pollen can be used to pollinate the flowers of the rest of the plant and produce feminized seeds.
- 🌱 HOW TO USE: Choose a plant that has not started flowering and is at least 2 weeks in the vegetative cycle (about 5” height). Spray one entire branch (not foliage), 3-4 times a day for 14-21 days. Before the pollen sacs open, cut off the branch, place it in a glass of water and wait for development to finish. At the same time, continue growing the plant until female flowers are showing. When ready, carefully dust your female flowers with pollen. Continue growing until feminized seeds mature.
- 🌱 BEST BENEFITS: By using Tiresias Mist, you not only gain all female seeds, but you also no longer have to wait weeks for deliveries and it allows you to create your own strain. Additionally, a tap root from a seed will produce higher yields and you can store seeds for future use and crop timing. It’s easier to transport seeds as opposed to seedlings or clones.
- 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.
- Solution Contents: Silver Thiosulfate Solution (STS) in a convenient 1 oz spray bottle for easy application
- Application Method: Professional-grade spray formulation designed for precise and controlled distribution
- Product Form: Liquid solution specifically formulated for botanical applications and research purposes
- Usage Instructions: Apply as directed following proper safety guidelines and recommended application protocols
- ✅ No Mixing, No Hassle – Our STS Feminized Seed-Making Spray is pre-mixed and ready to use, eliminating the need for dangerous dilution or guesswork.
- ✅ Advanced Node-Coating Technology – Enhanced with organic CANNA_COAT, our proprietary Node-Coating Technology increases absorption and speeds up effectiveness by up to 50% faster.
- ✅ Laboratory-Precision Formula – Created in our state-of-the-art plant research laboratory, ensuring purity, stability, and effectiveness for both home growers and commercial feminized seed production.
- ✅ 100% Fresh & Pure – Each solution is MADE ON THE DAY OF YOUR ORDER, guaranteeing freshness and laboratory-tested purity for consistent results
- ✅ Trusted by Growers – Perfect for feminized seed production with reliable, predictable results.
- 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.
- 🌱 100% FEMINIZED SEEDS: Tiresias Mist is the most reliable, safe and effective alternative for producing feminized seeds. One bottle is all it takes to provide enough solution to one branch that will produce female pollen. Transfer that pollen to the flowers of a dioecious plant and it will produce 100% feminized seeds. No more guessing!
- 🌱SAFE + FUN: Tiresias Mist is made of natural minerals and is non-toxic, non-allergenic and will not cause harm to humans, plants or pets. However, the stem being treated should not be consumed (it will be covered with pollen sacs). Most importantly, have fun, get crazy and be excited to start your own experiments. You now have the ability and the freedom to produce your own female seeds and save your favorite strains!
- 🌱 HOW IT WORKS: Whether you’re an amateur or a pro grower, Tiresias Mist makes it simple for anyone to create their own feminized seeds. 1 ounce will treat one branch of a plant to produce feminized seeds on the same plant or to produce genetically female crosses with other plants. Treating one branch enables that one branch to create male characteristics (pollen sacs) through which the pollen can be used to pollinate the flowers of the rest of the plant and produce feminized seeds.
- 🌱 HOW TO USE: Choose a plant that has not started flowering and is at least 2 weeks in the vegetative cycle (about 5” height). Spray one entire branch (not foliage), 3-4 times a day for 14-21 days. Before the pollen sacs open, cut off the branch, place it in a glass of water and wait for development to finish. At the same time, continue growing the plant until female flowers are showing. When ready, carefully dust your female flowers with pollen. Continue growing until feminized seeds mature.
- 🌱 BEST BENEFITS: By using Tiresias Mist, you not only gain all female seeds, but you also no longer have to wait weeks for deliveries and it allows you to create your own strain. Additionally, a tap root from a seed will produce higher yields and you can store seeds for future use and crop timing. It’s easier to transport seeds as opposed to seedlings or clones.
- EASILY MAKE 100 percent 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 percent 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.
The Ultimate Buying Guide for Feminized Seed Spray
Growing cannabis indoors or in a small space often requires controlling the sex of your plants. Male plants produce pollen, which can pollinate females, causing them to produce seeds instead of high-quality flowers. Feminized seed sprays offer a way for growers to encourage female plants to produce pollen sacs, turning them into temporary “males” to pollinate other females for seed collection. This guide helps you choose the best spray for your needs.
Key Features to Look For
When shopping for a feminized seed spray, several features matter greatly.
- **Active Ingredient Concentration:** The spray’s effectiveness depends on the concentration of the active ingredient. Look for sprays with reliable concentrations of silver thiosulfate (STS) or colloidal silver. Higher concentrations usually mean fewer applications are needed.
- **Ease of Application:** The spray bottle should offer a fine, even mist. A good nozzle prevents dripping and ensures the leaves absorb the solution evenly.
- **Shelf Life and Storage:** Check the expiration date. Improperly stored sprays can lose potency quickly. Most sprays need to be kept cool and dark.
- **Plant Safety Profile:** A quality spray minimizes harm to the female plant when used correctly. It should not cause excessive burning or stunt growth significantly after the treatment period ends.
Important Materials in Feminized Sprays
Feminized sprays primarily rely on two chemical agents to induce male characteristics (pollen production) in female plants:
Colloidal Silver (CS)
Colloidal silver is tiny particles of pure silver suspended in distilled water. It works by blocking the plant’s natural production of ethylene, a hormone that suppresses the development of male flower parts (stamens). CS is widely available and generally safe when used externally.
Silver Thiosulfate (STS)
STS is often considered more potent and faster-acting than colloidal silver. It is a chemical compound that also interferes with the plant’s hormonal balance, forcing the development of pollen sacs. STS requires careful handling due to its chemical nature, but growers often report higher success rates.
Factors That Improve or Reduce Quality
The quality of your results hinges on both the product and how you use it.
Factors Improving Quality:
- **Purity of Ingredients:** High-purity silver solutions lead to predictable results. Impurities can cause leaf burn or inconsistent pollen production.
- **Proper Timing:** Applying the spray during the early flowering stage (pre-flower) yields the best results.
- **Consistent Coverage:** Thoroughly coating the underside of leaves and budding sites ensures the plant absorbs enough of the active ingredient.
Factors Reducing Quality:
- **Using Tap Water:** If the spray solution is mixed using tap water instead of distilled water, minerals can interfere with the chemical reaction.
- **Over-Spraying:** Applying the solution too frequently or too heavily burns the leaves and stresses the plant, potentially leading to poor seed viability or stunted growth.
- **Using Low-Quality Sprays:** Cheap, poorly formulated sprays might not contain enough active ingredient, resulting in “hermies” (plants showing both male and female parts) instead of fully functional male pollen producers.
User Experience and Use Cases
Growers use feminized sprays for specific, controlled purposes.
Use Cases:
The primary use is creating seeds from female-only genetics. If you have a rare or highly desired female strain and want to save seeds without introducing a male plant into your grow space, this spray is essential. It allows you to self-pollinate the plant or pollinate a different female clone.
User Experience:
The process requires patience. Users typically spray the chosen branches or the entire plant every few days for two to three weeks. You must wear gloves and eye protection, especially when dealing with STS. After successful pollination, the treated branches will start showing pollen sacs. Experienced users appreciate the control this method offers over their genetics collection.
10 Frequently Asked Questions (FAQ) About Feminized Seed Spray
Q: What exactly does feminized seed spray do?
A: It chemically tricks a female cannabis plant into producing pollen instead of flowers. This pollen is genetically female.
Q: How long does it take to see results after spraying?
A: You usually start seeing small pollen sacs appear within seven to fourteen days after the initial spraying schedule is complete.
Q: Can I use this spray on an auto-flowering plant?
A: Yes, you can use it on auto-flowering plants, but you must be very careful not to stress them, as autos have a shorter lifespan.
Q: Is colloidal silver or STS better?
A: STS is generally stronger and faster, but colloidal silver is often considered safer and easier for beginners to handle without harsh safety gear.
Q: Do I need to spray the entire plant?
A: No, you only need to spray the specific branches you want to turn male. This allows you to keep the rest of the plant producing flowers for consumption.
Q: Should I use distilled water when mixing my spray?
A: Absolutely. Using distilled water ensures the active ingredients work correctly without interference from minerals found in tap water.
Q: What happens if I inhale the spray mist?
A: Inhaling silver particles is not healthy. Always spray in a well-ventilated area and wear a simple dust mask.
Q: Will the seeds produced be 100% female?
A: If the treated plant is pollinated successfully, the resulting seeds will be nearly 100% female because they only receive X chromosomes.
Q: How often should I spray the plant?
A: Most instructions suggest spraying every two to three days for about two weeks during the early flowering stage.
Q: Can I still smoke the buds from a sprayed plant?
A: Yes. Once the spraying schedule is finished and the pollen production is done, the plant returns to normal. You should rinse the treated areas thoroughly before harvest.