Struggling to track down where to buy Gnatrol for those pesky fungus gnats? You’re definitely not alone! It can feel like a bit of a treasure hunt, especially since Gnatrol, particularly its highly effective WDG Water Dispersible Granule form, is often marketed more towards professional growers than the average houseplant enthusiast. But don’t worry, I’ve done the digging for you, and while you might not find it on every street corner, there are plenty of reliable places to grab this fungus gnat slayer, both online and in specialized shops. We’re talking everything from dedicated hydroponic suppliers to global e-commerce sites, and even some niche online spots that’ll ship right to your door. So, let’s get those gnats gone!

Online Retailers: Your Best Bet for Gnatrol

When you’re looking for Gnatrol, especially if you need the more concentrated or larger quantities, online specialty stores are usually your best bet. They cater to a more dedicated gardening and hydroponic crowd, so they often stock products like Gnatrol that you might not see at your local big-box store.

Specialty Hydroponic & Garden Supply Stores

These retailers are typically where you’ll find Gnatrol in various sizes, including larger pails for serious infestations or bigger collections of plants. Think of them as the pros’ choice, but perfectly accessible for us home growers too!

Custom Hydro: They offer Gnatrol WDG in a 16 lb. pail, often with a sale price, making it a good option if you need a significant amount. They highlight Gnatrol as a selective biological larvicide that paralyzes fungus gnat larvae within 24 hours of ingestion.
Sunspot Supply: Another great option for the 16 lb. Gnatrol WDG bucket. They mention that it targets fungus gnat larvae in the soil of ornamental plants, bedding plants, and vegetable sets. One reviewer even noted that they used to get smaller containers on Amazon but now rely on a local nursery for smaller portions.
BetterGrow Hydro: You can find the 16 lb. Gnatrol WDG here, often with free ground shipping. They emphasize its OMRI listing and ease of use in its granule form.
Evolve Garden Supply: They also stock the 16 lb. Gnatrol WDG Biological Larvicide and ship throughout the lower 48 states. They detail its active ingredient, Bacillus thuringiensis, at 37.4%.
OrganicBTI.com: This site specifically focuses on BTI products, including Gnatrol WDG. They offer various sizes, even as small as 1/2 ounce to 5 pounds, which is fantastic if you don’t need a massive pail. They also offer free domestic shipping in the US and inexpensive international shipping.
Brite Ideas Aquaponics, Hydroponics & Organics: They carry Gnatrol Biological Larvicide, often in smaller quantities like 1/2 lb., making it more manageable for typical houseplant owners.
Harmony Farm Supply & Nursery: If you’re looking for larger quantities, they offer Gnatrol in a 16-pound pail.
Horticulture Source: They list Gnatrol WDG Insecticide in a 16lb size, noting it’s not for sale in AK or ME. They also suggest comparing prices on Amazon, which can be helpful.
Hydro45: This store also lists Gnatrol, and interestingly, their site shows various currency options, hinting at broader shipping capabilities.
SiteOne US: They carry Gnatrol WDG in 16 lb. pails, but their online availability might be restricted to certain areas, so it’s worth checking your location.

Many of these specialized online stores, like Hydroponics stores and garden supply stores, often provide detailed application instructions and product information, which can be super helpful.

Amazon and Other Large Online Marketplaces

Amazon used to be a go-to for smaller containers of Gnatrol, but it seems that might have shifted, with larger quantities being more common now. However, Amazon is still a treasure trove for various fungus gnat solutions. While direct Gnatrol might be harder to find in smaller sizes, you’ll definitely see a lot of effective alternatives.

You can often find great options for Fungus Gnat Killer, Mosquito Bits, or Sticky Traps for Fungus Gnats there. Products with Bacillus thuringiensis israelensis BTI, the active ingredient in Gnatrol, are frequently sold under different brand names, so keep an eye out for that if Gnatrol itself isn’t popping up. Some customers have even left reviews mentioning they bought Gnatrol WDG on Amazon in the past, finding it highly effective.

eBay

eBay can be a fantastic resource, especially for smaller quantities of Gnatrol. I’ve seen listings for 1 ounce to 1 pound containers, which is perfect if you just have a few houseplants and don’t need a huge amount. It’s also a place where you might find sellers willing to ship internationally. For example, Gnatrol WDG Biological Larvicide is available on eBay Australia and eBay in the US, often from sellers specializing in seed or pest control products.

Ubuy International Shipping

For folks outside the US, like in Australia or the UK, where Gnatrol might not be readily available locally, Ubuy is a solid option. They offer international shipping for products like Gnatrol WDG Biological Larvicide in Australia and Gnatrol WDG in the UK, even if it means a slightly longer delivery time. Just be mindful of potential shipping costs, VAT, and customs charges.

Where to Buy Gnatrol Near Me: Local Options

Finding Gnatrol in a physical store can be a bit trickier than ordering online, especially if you’re looking for the specific Gnatrol brand. It’s not typically a product you’d grab during your weekly grocery run or even at all big hardware stores.

Local Nurseries and Garden Centers: Your best bet for finding Gnatrol locally is often at independent nurseries or specialized garden centers. These places tend to cater to more serious gardeners and might carry a wider range of pest control solutions. Even if they don’t have Gnatrol specifically, they might have other BTI-based products that work similarly, such as Mosquito Dunks or Mosquito Bits. One customer mentioned finding smaller portions of Gnatrol at a nursery near them when Amazon stopped carrying smaller sizes.
Hydroponic Stores: If you have a hydroponic supply store nearby, definitely check them out! Gnatrol is a popular product in the hydroponics community for controlling fungus gnats in growing systems, so these stores are very likely to carry it.
Big Box Stores like Home Depot or Lowe’s: While Home Depot offers a variety of pest control solutions and advice on how to get rid of gnats, they don’t seem to consistently stock Gnatrol itself. You’re more likely to find general gnat sprays, sticky traps, or alternative solutions like Diatomaceous Earth there. It’s worth a quick call to your local store, but don’t get your hopes too high for Gnatrol specifically.

Regional Availability: Gnatrol Beyond the USA

The availability of Gnatrol can vary quite a bit depending on where you live. Here’s a quick rundown for some key regions:

Where to Buy Gnatrol in Canada

For our friends up north, getting Gnatrol directly might require a bit more effort.

Online Specialty Stores: Your best bet is typically through online hydroponic or garden supply stores that ship to Canada. Some general e-commerce platforms like Hydro45 might also offer shipping.
Etsy Canada: While you might not find Gnatrol directly on Etsy Canada, you can often find other excellent fungus gnat killer products, including BTI granules or other organic pest control solutions that function similarly. Just use “fungus gnat killer” or “BTI granules” in your search.

Gnatrol Australia Where to Buy

It seems Gnatrol can be a bit elusive in Australia if you’re looking for it locally.

Ubuy Australia: This is a strong contender for purchasing Gnatrol WDG and having it shipped to Australia. Be prepared for international shipping times and potential import costs.
eBay Australia: You can find listings for Gnatrol WDG Biological Larvicide on eBay Australia, often shipped from the US, so factor in shipping costs and delivery times.
Local Alternatives: An Australian Cacti Forum discussion from 2008 suggested that Gnatrol’s active ingredient, Bacillus thuringiensis israelensis BTI, is the same as in “mozzie dunks” mosquito control tablets, which are often available at hardware stores like Bunnings or places that sell water garden supplies. So, if direct Gnatrol is hard to find, looking for Mosquito Dunks Australia or other BTI products could be a good workaround.
Desertcart Australia: This platform also lists Gnatrol WDG, though it might be out of stock at times, emphasizing its global shipping nature.

Gnatrol UK Where to Buy

Similar to Australia, direct local availability for Gnatrol in the UK can be limited.

Ubuy UK: This is a good option for ordering Gnatrol WDG and having it shipped to the UK. Again, be mindful of potential VAT and customs charges.
Etsy UK: While direct Gnatrol listings might be scarce, you can find various “Fungus Gnat killer” or “Mosquito Dunks” products on Etsy UK that use BTI or other effective methods.
Local Alternatives: Look for products containing Bacillus thuringiensis israelensis BTI at local garden centers or online. These will offer similar control for fungus gnat larvae.

Gnatrol Powder WDG for Fungus Gnats

When you hear “Gnatrol powder,” people are usually referring to Gnatrol WDG, which stands for Water Dispersible Granule. This is the modern formulation of Gnatrol, replacing older liquid versions. The WDG form is super convenient because it’s easier to measure and mix, and it won’t leave any residue on your plants.

Gnatrol WDG works by introducing Bacillus thuringiensis subspecies israelensis BTI into the soil. When fungus gnat larvae ingest the BTI, it produces toxins that paralyze their digestive system, causing them to stop feeding and die within 24 hours. This makes it a highly effective and targeted solution for fungus gnats without harming your plants or beneficial insects. Plus, it’s often OMRI-listed, meaning it’s approved for organic production.

For optimal results, you usually apply Gnatrol WDG as a soil drench. The general recommendation is to apply it every 5 days for about 15-20 days to break the fungus gnat life cycle effectively.

Why Gnatrol is a Go-To for Fungus Gnats

Gnatrol is a favorite among plant parents and professional growers for several good reasons:

Targeted Control: It specifically targets fungus gnat larvae, leaving beneficial insects, pets, and humans unharmed. This is crucial for maintaining a healthy ecosystem in your garden or home.
Organic Certified: Many Gnatrol WDG products are OMRI-listed, making them suitable for organic gardening and edible crops, even up to the day of harvest. This is a big plus if you’re conscious about what you’re putting on your plants.
Effective: It works quickly, with larvae stopping feeding almost immediately and dying within 24 hours of ingestion. Users often report seeing a significant reduction in gnats after a few applications.
Easy to Use: The WDG formulation is simple to measure and mix with water, then apply as a soil drench. No complicated setups or messy applications are needed.

So, while tracking down Gnatrol might involve a few extra clicks or a trip to a specialized store, its effectiveness and safety make it a worthwhile investment for tackling those annoying fungus gnats.

Frequently Asked Questions

What is Gnatrol used for?

Gnatrol is a biological larvicide primarily used to control fungus gnat larvae in the soil of plants, including ornamentals, bedding plants, vegetable sets, and even cannabis facilities. It contains Bacillus thuringiensis subspecies israelensis BTI, a naturally occurring bacterium that targets the larval stage of fungus gnats. It doesn’t kill adult gnats directly, but by eliminating the larvae, it breaks their life cycle, leading to a significant reduction in the adult population.

Is Gnatrol safe for pets and plants?

Yes, Gnatrol is considered safe for pets, humans, aquatic life, and beneficial insects when used as directed. The active ingredient, BTI, is highly selective, meaning it only affects the larvae of specific insects, primarily mosquitoes, black flies, and fungus gnats, after they ingest it. It doesn’t harm plants themselves and is OMRI-listed for organic production, making it a popular choice for organic growers.

How quickly does Gnatrol work?

Gnatrol is relatively fast-acting. Once fungus gnat larvae ingest the BTI, they become paralyzed and stop feeding immediately, typically dying within 24 hours. For complete eradication of an infestation, it’s usually recommended to apply Gnatrol as a soil drench every 5 days for about 15-20 days to ensure you catch all generations of larvae and fully break their life cycle.

Can I use Gnatrol in hydroponics?

Yes, Gnatrol WDG can absolutely be used in hydroponic systems. The application is similar to soil drenching, where you add the BTI to your nutrient solution. It’s recommended to apply it three times total, once every 5 days, to effectively break the fungus gnat life cycle in your hydroponic tank.

Is there a cheaper alternative to Gnatrol?

While Gnatrol is highly effective, some alternatives, particularly those using the same active ingredient BTI, can be more readily available or cost-effective in smaller quantities. Mosquito Bits and Mosquito Dunks are popular BTI-based products that many gardeners use as a substitute for fungus gnat control. You can steep Mosquito Bits in water to create a BTI solution for watering plants, or simply place Mosquito Dunks in water that you then use for irrigation. You can find these at many garden centers or online, like Mosquito Dunks on Amazon. Other methods like yellow sticky traps which catch adult gnats but not larvae and proper watering practices can also help manage infestations.

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What’s the difference between Gnatrol and Mosquito Bits/Dunks?

The main difference lies in their formulation and intended primary use, though they share the same active ingredient. Gnatrol WDG is a concentrated, water-dispersible granule specifically formulated for fungus gnat larvae in soil and growing media. It’s precise and designed for easy mixing into water for drenching. Mosquito Bits are small, granular pieces often corn cob based that also contain BTI, commonly used for broad-area mosquito control but effective against fungus gnats when steeped in water and used as a drench. Mosquito Dunks are solid, donut-shaped tablets of BTI primarily for killing mosquito larvae in standing water, but they can be broken up and added to watering cans for fungus gnat control. Essentially, they all leverage BTI to target larvae, but Gnatrol is specifically engineered for horticultural use against fungus gnats, offering a potentially more consistent and targeted application.

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