Best Fungus Gnat Spray For Indoor Plants: 10 Options Compared

#1 · Best Overall

1. Nature's Dome Gnat Spray

• Form: Liquid
• Weight: 0.54 kg

Best for: Soil-surface gnat misting.

Why it ranks #1: This focused 16-ounce spray directs users to mist flying gnats and lightly coat soil tops, pots, and windowsills, matching common indoor plant treatment areas.

A shake-and-spray formula with directions for misting flying gnats and lightly coating soil tops gives indoor plant owners a straightforward way to treat both the airspace and nearby growing surfaces. The product also lists fruit flies and indoor-outdoor houseplant use, extending its role beyond gnat treatment alone.

The instructions specify spraying flying gnats directly, then lightly coating soil tops, pots, and windowsills. That lets a plant owner include common areas around a pot in one treatment routine without needing a separate application tool. The formula works on contact while wet, so the stated effect is tied to direct wet coverage rather than a lasting residual claim. It comes in a spray bottle and is listed for indoor and outdoor use on houseplants and indoor gardening.

Skip it if you want a soil drench targeting larvae rather than a contact mist; Microbe Life Hydroponics FGX PH22164 is applied to soil.

Pick this for indoor gardeners who want a simple spray routine that includes soil surfaces and nearby windowsills. Its contact action depends on wet coverage, so it is not the listed choice for a soil-drench approach to larvae.

Listed on Amazon as: Nature's Dome Fungus Gnat Killer Spray 16 oz for Houseplants & Soil

#2 · Best Larvae Treatment

2. Microbe Life Hydroponics FGX

• Form: Liquid

Best for: Soil-drench larval control.

Why it ranks #2: Its Bti formula targets gnat larvae in soil and is applied as a soil drench, making it a distinct option for breaking the lifecycle below the surface.

Natural Bti targets fungus gnat larvae in soil, giving this 8-ounce treatment a lifecycle-focused role: the product says it helps prevent adults from emerging. Its soil-drench directions also list potted plants and hydroponics, making it a distinct option for growers treating the root-zone environment.

Rather than describing a leaf spray, the product directs users to apply the liquid as a soil drench for potted plants and hydroponics. Its Bti ingredient targets gnat larvae, and the supplied description says breaking the lifecycle in soil prevents adults from emerging. That focus can suit growers addressing the source in the growing medium. The 8-ounce bottle is smaller than many listed sprays, and the product is identified as natural and non-toxic to plants, pets, and people.

Skip it if you want a spray directed at flying gnats and windowsills as well as soil; Nature's Dome GNAT-16OZ-FBA-2026 lists those contact applications.

This suits growers treating gnat larvae in potted plants or hydroponic systems with a soil drench. Its stated focus is the soil lifecycle, so choose it for that application rather than as a general leaf or flying-gnat spray.

Listed on Amazon as: Microbe Life Hydroponics FGX Fungus Gnat Killer, Natural BTi Pest Control for Plants, Indoor Plant Pest Control to Get Rid of Gnats in Houseplants, Safe for Pets & People, 8 Fl Oz

#3 · Best With Traps

3. Kate's Home & Garden Bundle

• Form: Pac
• Weight: 1.3 lb

Best for: Trap-and-spray indoor gardeners.

Why it ranks #3: The 16-ounce plant spray comes with 12 sticky traps and lists fungus gnats, spider mites, and fruit flies, combining spray with trap placement.

The 16-ounce plant spray arrives with 12 sticky traps, giving indoor growers two ways to address fungus gnats: spray the plants and place traps near affected areas. Its listed targets also include spider mites and fruit flies, making the bundle relevant when more than one pest is present around houseplants.

Peppermint and rosemary oils are among the listed ingredients, and the product is described as killing and repelling fungus gnats and fruit flies. The included sticky traps add a separate monitoring and capture option near affected plants, rather than relying on spray alone. Its 16-ounce bottle suits routine plant care, while the label calls for keeping it away from children and pets and avoiding eye and skin contact. Use the traps near affected areas as directed.

Skip it if you want a soil drench aimed at gnat larvae; Microbe Life Hydroponics FGX PH22164 is specifically applied as a soil drench.

Choose this bundle if you want a plant spray plus sticky traps for indoor pest management, especially when gnats, mites, or fruit flies are concerns. Follow the label’s precautions around children, pets, eyes, and skin.

Listed on Amazon as: Kate's Home & Garden Plant Spray for Insects & Gnats, 12 Sticky Traps, 16oz

#4 · Best Fine-Mist Sprayer

4. Smart Grower Gnat Mister

• Form: Liquid
• Weight: 10 oz

Best for: Refillable fine-mist gnat coverage.

Why it ranks #4: This 10-ounce product includes a continuous fine-mist sprayer and lists rosemary, peppermint, cedarwood, and geraniol oils for treating leaves and soil.

A refillable continuous fine-mist sprayer pairs with a four-oil blend of rosemary, peppermint, cedarwood, and geraniol, letting plant owners apply an even mist to leaves and soil. The 10-ounce formula is described as targeting fungus gnats, eggs, and larvae on contact.

The continuous sprayer is specified for precise, even coverage, which can help distribute the liquid across plant leaves and soil without switching application tools. Its four-oil blend is listed as targeting fungus gnats, eggs, and larvae on contact, while the directions say to shake well and spray leaves and soil. The refillable bottle supports continued use of the sprayer, but the supplied size is 10 ounces, a relevant capacity consideration for larger plant collections.

Skip it if you want a larger ready-to-use bottle for broad plant coverage; Yardi Houseplant Pest & Disease Spray is supplied in a 32-ounce size.

This suits indoor growers who value a refillable continuous mist and want to target gnats across leaves and soil. The 10-ounce size is a practical boundary to weigh if you have many plants to cover.

Listed on Amazon as: Continuous Natural Gnat Killer Plant Mister Spray For Plants and Soil 10oz

#5

5. Kate's Garden Plant Spray

• Form: Oil
• Weight: 1.2 lb

Best for: Essential-oil indoor plant spray.

Why it ranks #5: The 16-ounce spray specifically lists fungus gnats, spider mites, and fruit flies; its directions recommend testing one or two leaves before wider application.

Peppermint oil, rosemary oil, geraniol, soap, and sesame oil make up the listed ingredients in this 16-ounce plant spray, which targets fungus gnats, spider mites, and fruit flies. Its stated indoor and outdoor plant use lets growers apply the same product across houseplant and garden care.

The spray is described as killing fungus gnats, spider mites, and fruit flies, and its ingredients include peppermint and rosemary oils. For a cautious application workflow, the directions advise testing one or two leaves and waiting an hour before spraying the whole plant. That step gives the user a stated way to check a small area first. The 16-ounce size supports plant-care use, while the product information identifies it as an oil-form spray for indoor or outdoor plants.

Skip it if you want sticky traps included with the spray; Kate's Home & Garden model 466 bundles 12 traps with its plant spray.

Choose this for indoor or outdoor plant owners seeking an essential-oil spray for gnats and other listed pests. Its leaf-test direction adds a preliminary step before treating a whole plant, so allow time for that check.

Listed on Amazon as: Plant Spray for Insects & Getting Rid of Gnats (16oz)

#6

6. NatureStop Gnat Killer

• Form: Spray
• Weight: 16 oz

Best for: Indoor fungus-gnat soil care.

Why it ranks #6: This 16-ounce essential-oil spray is designed for indoor plants and can be applied to soil surfaces, pots, saucers, and nearby growing areas.

Its application directions cover soil surfaces, pots, saucers, and surrounding growing areas, giving indoor plant owners several common gnat-active locations to treat with one spray. The essential-oil formula is presented as an alternative to harsh chemical-heavy treatments, with fungus gnats as its central target.

NatureStop describes this spray as fast-acting fungus gnat control and directs users to apply it around soil surfaces, pots, saucers, and nearby growing areas. Those locations align with the product description’s account of where gnats are commonly found around houseplants. Its essential-oil formula is positioned for gardeners seeking an alternative to harsh chemical-heavy treatments, and the product says it is safe for use on plants when used as directed. It comes as a 16-ounce spray bottle.

Skip it if you want one spray with listed control for mites and fungal diseases too; Bonide Captain Jack's model 0226 covers insects, mites, and fungi.

This fits indoor growers focused on fungus gnats around pots, saucers, and soil, especially those seeking an essential-oil spray. Its listed claims center on gnats, so consider that focus if you have other pest or disease concerns.

Listed on Amazon as: NatureStop Fungus Gnat Killer for Indoor Plants (16oz)

#7

7. BioAdvanced Houseplant Spray

• Form: Spray
• Weight: 1.5 lb

Best for: Houseplant pest-and-disease spray.

Why it ranks #7: The 24-ounce spray lists fungus gnats among its pests and also controls listed fungal diseases, but its directions require pests to contact the spray.

One bottle combines insect, mite, and disease control for houseplants, flowers, and herbs, giving indoor growers a multi-purpose treatment option. Its listed targets include fungus gnats and powdery mildew, while directions specify spraying plants directly so pests must contact the formula to be controlled.

The 24-fluid-ounce spray lists fungus gnats, aphids, and whiteflies among its insect targets, and powdery mildew, rust, and leaf spot among its disease targets. That combination can simplify care when pest and fungal concerns occur on the same houseplants, flowers, or herbs. The directions call for shaking the bottle and spraying directly onto plants. Because the product states that pests need to be contacted by the spray, application coverage is central to its insect-control workflow.

Skip it if you want a multi-oil spray that specifically claims contact action against gnat eggs and larvae; Smart Grower GS10F lists those stages.

This suits growers wanting one spray for listed insect, mite, and fungal concerns on houseplants, flowers, or herbs. Its contact requirement makes thorough direct coverage important when addressing insect pests.

Listed on Amazon as: BioAdvanced Houseplant Insect and Mite Control Spray – 24 fl oz Bottle

#8

8. YARDi Houseplant Spray

• Form: Aerosol

Best for: Ready-to-use pest and mildew spray.

Why it ranks #8: This ready-to-use 32-ounce spray lists fungus gnats alongside several other houseplant pests and also treats mold, mildew, and fungus.

A ready-to-use 32-ounce bottle treats listed pests and fungal problems without mixing or measuring, giving houseplant owners a single-step application workflow. Its target list includes fungus gnats, spider mites, and thrips, while the same spray is also described for mold, mildew, and fungus.

The trigger-operated spray is described as ready to use: pull the trigger, with no mixing or measuring. Its pest list includes aphids, whiteflies, spider mites, mealybugs, fungus gnats, and thrips, while the product also treats mold, mildew, and fungus. Peppermint oil, cinnamon oil, and citric acid are listed as active ingredients. Combining pest and fungal treatment in a 32-ounce bottle can reduce the need to manage separate products for those stated concerns.

Skip it if you want a small soil drench specifically aimed at larvae; Microbe Life Hydroponics FGX PH22164 is an 8-ounce soil-drench product.

Choose this for houseplant owners who want ready-to-use coverage for both listed pests and fungal problems. Its aerosol format and broad target list suit general treatment, while the product’s claims do not specify a soil-drench method.

Listed on Amazon as: YARDi Houseplant Pest & Disease Spray 32 oz Fungus Gnat & Mite Killer

#9

9. Mighty Mint Plant Spray

• Form: Liquid

Best for: Peppermint-oil plant protection.

Why it ranks #9: Its 16-ounce peppermint-oil formula is described as helping deter gnats and other pests, but the listing does not give specific fungus gnat application directions.

Peppermint oil is the defining ingredient in this 16-ounce plant spray, giving gardeners a plant-based option aimed at deterring common pests around houseplants and garden plants. Its listed concerns include gnats, spider mites, and aphids, as well as fungus issues, for broader plant-protection use.

The formula lists peppermint oil alongside rosemary oil and geraniol, and the product describes these plant-based ingredients as helping deter pests and support healthier plants. Its stated targets include gnats, spider mites, aphids, and other plant-damaging insects, as well as fungus issues. At 16 fluid ounces, it offers a ready-to-use liquid format for plant care on a windowsill or in a garden. Safety around people and pets is conditional: use it as directed on the label.

Skip it if you need explicit contact-kill directions for flying gnats and soil surfaces; Nature's Dome GNAT-16OZ-FBA-2026 specifies those application steps.

This is a fit for plant owners seeking peppermint-oil-based protection against several common pests. Consider its stated deterrent role and label-directed use when deciding whether it matches your need for direct gnat-kill instructions.

Listed on Amazon as: Mighty Mint Peppermint Oil Plant Protection Spray, 16 oz

#10

10. Bonide Captain Jack's Neem Oil

• Form: Liquid
• Weight: 2.3 lb

Best for: Multi-purpose neem garden care.

Why it ranks #10: This 32-ounce neem oil spray serves broad insect, mite, and fungal uses, but its listed pests do not specifically include fungus gnats.

Neem oil gives this ready-to-use spray three roles—fungicide, insecticide, and miticide—so plant owners can address several kinds of garden problems with one bottle. Its listed use spans houseplants, roses, trees, shrubs, fruits, nuts, and vegetables, making it a broad option beyond fungus-gnat control alone.

The 32-ounce bottle contains clarified hydrophobic extract of neem oil, which the supplied information identifies for control of insects, mites, and fungal diseases. Its stated pest coverage includes fruit flies, while disease examples include powdery mildew and rust. For plant care, the directions say to shake well and spray all plant surfaces, including leaf undersides; that coverage step matters for a product whose instructions call for direct application. Reapply as needed, according to the label.

Skip it if you want a spray specifically described for lightly coating soil tops and windowsills; Nature's Dome GNAT-16OZ-FBA-2026 lists those application areas.

This suits plant owners who want neem-based coverage for pests, mites, and fungal diseases across houseplants and outdoor garden plants. It is a broad garden treatment, so follow the directions for full-surface spraying and repeat applications.

Listed on Amazon as: Bonide Captain Jack's Neem Oil Spray for Plants, 32 oz Ready-to-Use