Updated:March, 2026

10 Best Fungicide For Hydrangea Leaf Spot of 2026

Best Choice

9.9

Outstanding

ARBER

Organic Fungicide for Plants – Liquid Concentrate for Indoor & Outdoor Use; Treats Powdery Mildew, Leaf Spot, Root Rot & Lawn Diseases; Mushroom & Rust Control; Safe Around Kids, Pets & Pollinators

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Why We Love It

Stop disease from stealing your bloomsthis organic fungicide knocks back powdery mildew, leaf spot, root rot and lawn fungi fast, helping leaves green up and buds bounce back. Spray after humid days, before gatherings, and during peak growth.
Powered by certified-organic biologicals and plant-derived actives that create a protective barrier on leaves and roots, supporting soil microbiome balance for lasting resilience. Gentle on foliage; no harsh residues or synthetic chemicals.
Versatile concentrate for houseplants, trees, roses, veggies, shrubs and lawnsideal in greenhouses, raised beds, balconies and yards. Dilutes easily for repeat treatments; use after mowing, on long rainy weeks, and when new growth appears.
Family- and pollinator-conscious formulasafe around kids, pets and beneficial insects when used as directed. Low-odor, indoor-friendly, and garden safe for organic gardening routines. Keep peace of mind while you protect every corner of your garden.
Easy mix-and-spray routine fits busy days: measure, dilute, and coat leavesbefore sunrise watering, after travel, or ahead of weekend parties. Shelf life up to 3 years so youre always stocked to grow confidently, season after season.

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Why We Love It

Stop disease from stealing your bloomsthis organic fungicide knocks back powdery mildew, leaf spot, root rot and lawn fungi fast, helping leaves green up and buds bounce back. Spray after humid days, before gatherings, and during peak growth.
Powered by certified-organic biologicals and plant-derived actives that create a protective barrier on leaves and roots, supporting soil microbiome balance for lasting resilience. Gentle on foliage; no harsh residues or synthetic chemicals.
Versatile concentrate for houseplants, trees, roses, veggies, shrubs and lawnsideal in greenhouses, raised beds, balconies and yards. Dilutes easily for repeat treatments; use after mowing, on long rainy weeks, and when new growth appears.
Family- and pollinator-conscious formulasafe around kids, pets and beneficial insects when used as directed. Low-odor, indoor-friendly, and garden safe for organic gardening routines. Keep peace of mind while you protect every corner of your garden.
Easy mix-and-spray routine fits busy days: measure, dilute, and coat leavesbefore sunrise watering, after travel, or ahead of weekend parties. Shelf life up to 3 years so youre always stocked to grow confidently, season after season.

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9.5

Excellent

Earth's Ally

Earth's Ally Disease Control Concentrate for Plants Concentrate 32 oz | Fungicide Treatment for Powdery Mildew, Blight, Black Spot, Fungus - Use on Plant & Rose Diseases & More

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Main Highlights

TREATS AND CONTROLS PLANT DISEASE - Maintain the health of your plants with Earths Ally fungicide spray. Tackle common plant diseases including powdery mildew, downy mildew, blight, canker, black spot and leaf spot. Also functions as a complete fungicide, giving your plants all-in-one disease protection.
SAFE FOR PEOPLE, PETS & PLANET - Formulated with citric acid, Earths Ally Disease Control is a natural fungicide spray that cures and prevents common plant diseases.
NO HARSH CHEMICALS A safer alternative to harsh chemicals that leaves behind no harmful residues. Use our garden disease control on fruits, vegetables, flowers, ornamentals, trees and shrubs.
ENVIROMENTALLY RESPONSIBLE Earths Ally Disease Control is an OMRI Listed formula, suitable for use in organic gardening and environmentally safe. Our plant disease control spray can be used on fruits and vegetables up until day of harvest.
CONCENTRATED FORMULA Makes 10 gallons of ready-to-use product. Mix 6 tablespoons of concentrate in 1 gallon of water.

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Main Highlights

TREATS AND CONTROLS PLANT DISEASE - Maintain the health of your plants with Earths Ally fungicide spray. Tackle common plant diseases including powdery mildew, downy mildew, blight, canker, black spot and leaf spot. Also functions as a complete fungicide, giving your plants all-in-one disease protection.
SAFE FOR PEOPLE, PETS & PLANET - Formulated with citric acid, Earths Ally Disease Control is a natural fungicide spray that cures and prevents common plant diseases.
NO HARSH CHEMICALS A safer alternative to harsh chemicals that leaves behind no harmful residues. Use our garden disease control on fruits, vegetables, flowers, ornamentals, trees and shrubs.
ENVIROMENTALLY RESPONSIBLE Earths Ally Disease Control is an OMRI Listed formula, suitable for use in organic gardening and environmentally safe. Our plant disease control spray can be used on fruits and vegetables up until day of harvest.
CONCENTRATED FORMULA Makes 10 gallons of ready-to-use product. Mix 6 tablespoons of concentrate in 1 gallon of water.

9.5

Excellent

Bonide

Bonide (BND141) - Sulfur Plant Fungicide, Organically Controls Rust, Leaf Spot and Powdery Mildew (1 lb.), Ready-to-Use

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Main Highlights

Control and prevent common garden diseases with Sulfur Plant Fungicide Micronized Spray or Dust from Bonide!
This fungicide controls diseases including rust, leaf spot, mildew and more. Sulfur Plant Fungicide can be applied to fruits, vegetables and ornamentals in your garden to prevent disease.
Sulfur Plant Fungicide also works as a pesticide! Apply to animals to help control fleas, ticks and mites! This product can be applied directly to dogs, horses, cattle, swine, game birds and more.
Approved for organic gardening, Sulfur Plant Fungicide is suitable for the production of organic produce and can even be used up until the day of harvest.
This product arrives conveniently ready-to-use! To use, apply as a dust or mix with water to create a micronized liquid. Fine sulfur particles adhere to plants easily to control disease. For full use instructions, please see product label.

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Main Highlights

Control and prevent common garden diseases with Sulfur Plant Fungicide Micronized Spray or Dust from Bonide!
This fungicide controls diseases including rust, leaf spot, mildew and more. Sulfur Plant Fungicide can be applied to fruits, vegetables and ornamentals in your garden to prevent disease.
Sulfur Plant Fungicide also works as a pesticide! Apply to animals to help control fleas, ticks and mites! This product can be applied directly to dogs, horses, cattle, swine, game birds and more.
Approved for organic gardening, Sulfur Plant Fungicide is suitable for the production of organic produce and can even be used up until the day of harvest.
This product arrives conveniently ready-to-use! To use, apply as a dust or mix with water to create a micronized liquid. Fine sulfur particles adhere to plants easily to control disease. For full use instructions, please see product label.

9.2

Excellent

Bonide

BONIDE Products INC 142 Sulfur Plant Fungicide Organically Controls Rust, Leaf Spot and Powdery Mildew, 4 lbs (2)

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Main Highlights

CONTROLS A VARIETY OF INSECTS AND DISEASES - Sulfur Plant Fungicide is effective against rust, leaf spot, powdery mildew, chiggers, thrips, scale, and listed mites.
USE ON FRUITS, VEGETABLES, AND ORNAMENTALS - Product is approved for organic gardening and can be used on apples, beans, cherries, berries, peas, grapes, strawberries, and many more fruits and vegetables in your garden.
USE ON ANIMALS - Helps control fleas and ticks on dogs, horses, cattle, swine, sheep, and goats. Can also be used to control depluming mites on chickens, turkeys, ducks, geese, pigeons, and other game birds.
GREATER EFFICIENCY - The extremely fine particle size contributes to a uniform film-forming layer, better adhesion and more even distribution of particles over fruit and leaf surfaces, resulting in greater efficiency.
ORGANIC GARDENING - The active ingredient of this product is sulfur, which is a natural chemical that is required by plants for normal, healthy growth. Our fungicide is approved for organic gardening and is safe for use around people and pets alike.

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Main Highlights

CONTROLS A VARIETY OF INSECTS AND DISEASES - Sulfur Plant Fungicide is effective against rust, leaf spot, powdery mildew, chiggers, thrips, scale, and listed mites.
USE ON FRUITS, VEGETABLES, AND ORNAMENTALS - Product is approved for organic gardening and can be used on apples, beans, cherries, berries, peas, grapes, strawberries, and many more fruits and vegetables in your garden.
USE ON ANIMALS - Helps control fleas and ticks on dogs, horses, cattle, swine, sheep, and goats. Can also be used to control depluming mites on chickens, turkeys, ducks, geese, pigeons, and other game birds.
GREATER EFFICIENCY - The extremely fine particle size contributes to a uniform film-forming layer, better adhesion and more even distribution of particles over fruit and leaf surfaces, resulting in greater efficiency.
ORGANIC GARDENING - The active ingredient of this product is sulfur, which is a natural chemical that is required by plants for normal, healthy growth. Our fungicide is approved for organic gardening and is safe for use around people and pets alike.

9.0

Excellent

Liquid Harvest

Liquid Harvest Broad Spectrum Disease Control – 32 Ounces - 14.3% Propiconazole Fungicide for Turf, Ornamentals & Plants – Effective Against Powdery Mildew, Rust, Leaf Spot & More for Healthier Plants

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Main Highlights

USE: Fungicide for broad spectrum and systemic disease control for turf, ornamentals, and other landscape and nursery plants.
DOSING: Use .5- 4 fl. oz. per gallon per 1,000 sq. ft. Always refer to label for specific dosing.
ACTIVE: This product is 14.3% Propiconazole.
CONTROLS: Powdery Mildew, Red Thread, Gray Leafspot, Summer Patch Poa Patch, Spring Dead Spot, Snowmold, Dichondra Rust and more.
PREVENTATIVE & CURATIVE: Works both to prevent disease development and to treat existing infections, promoting healthier, more vibrant plants and turf

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Main Highlights

USE: Fungicide for broad spectrum and systemic disease control for turf, ornamentals, and other landscape and nursery plants.
DOSING: Use .5- 4 fl. oz. per gallon per 1,000 sq. ft. Always refer to label for specific dosing.
ACTIVE: This product is 14.3% Propiconazole.
CONTROLS: Powdery Mildew, Red Thread, Gray Leafspot, Summer Patch Poa Patch, Spring Dead Spot, Snowmold, Dichondra Rust and more.
PREVENTATIVE & CURATIVE: Works both to prevent disease development and to treat existing infections, promoting healthier, more vibrant plants and turf

8.8

Very Good

Safer

Safer Brand Garden Fungicide Ready-to-Use Spray - Prevents & Controls Powdery Mildew, Black Spot, Leaf Spot & Rust - OMRI Listed for Organic Gardening - SG5450, 24 oz Spray

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Main Highlights

CONTROLS & PREVENTS FUNGUS: Sulfur attacks fungal diseases, including powdery mildew, black spot, rust, and leaf spot, ultimately stopping the spread of the fungus
GENTLE ON PLANTS: This Safer Garden sprays unique formulation is gentle on plants when used as directed and can be used all the way up until the day before harvest
PROTECT YOUR PLANTS: This fungicide spray is OMRI Listed for compliant use in organic gardening and can be used to protect roses, flowers, foliage plants, fruits & vegetables
EASY TO USE: The 24 oz ready-to-use spray bottle makes application a breeze. Apply at the first sign of disease, spraying plants thoroughly to saturate the upper and lower surfaces of the foliage
USE THROUGHOUT THE SEASON: Reapply at regular intervals depending on your plant type, after rain, or as needed to control fungal diseases on your plants. It can also be used up until the day before harvest

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Main Highlights

CONTROLS & PREVENTS FUNGUS: Sulfur attacks fungal diseases, including powdery mildew, black spot, rust, and leaf spot, ultimately stopping the spread of the fungus
GENTLE ON PLANTS: This Safer Garden sprays unique formulation is gentle on plants when used as directed and can be used all the way up until the day before harvest
PROTECT YOUR PLANTS: This fungicide spray is OMRI Listed for compliant use in organic gardening and can be used to protect roses, flowers, foliage plants, fruits & vegetables
EASY TO USE: The 24 oz ready-to-use spray bottle makes application a breeze. Apply at the first sign of disease, spraying plants thoroughly to saturate the upper and lower surfaces of the foliage
USE THROUGHOUT THE SEASON: Reapply at regular intervals depending on your plant type, after rain, or as needed to control fungal diseases on your plants. It can also be used up until the day before harvest

8.6

Very Good

Atticus

Atticus Artavia 2 SC Azoxystrobin Fungicide (1 GAL) - Fungus Control for Lawns and Landscapes - Anthracnose, Brown Patch, Leaf Spot, Rhizoctonia

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Main Highlights

LEAF-TO-ROOT FUNGUS PROTECTION: Artavia 2 SC contains 22.9% azoxystrobin; the same active ingredient as the leading brand. Used by the pros, azoxystrobin moves within the plant to deliver trusted root-to-leaf protection.
FIGHT MULTIPLE FUNGI WITH ONE WEAPON: Combat more than 20 turf and 30 ornamental plant fungi with one product. Broad-spectrum Artavia 2 SC controls most foliar and soil-borne fungi including troublesome anthracnose, leaf spot, rhizoctonia, spring dead spot, and brown patch. See the label for complete fungi control list.
TOTAL PLANT DEFENSE: Artavia 2 SC is absorbed by leaves and roots for inside-out protection against foliar and soil-borne fungi. Plus, Artavia moves within the plant to deliver total defense from the root bottom to the leaf tip including tender new growth.
EASE THE WORKLOAD WITH EXTENDED APPLICATION WINDOWS: Many target fungi are labeled at application intervals up to 28 days so you can go longer between sprays. Keep fungi and workloads at bay with long-lasting Artavia 2 SC. See the label for complete use directions and application intervals.
APPLY PROTECTION WHERE YOU NEED IT: Approved for use on a variety of plants, Artavia 2 SC delivers powerful fungus control to turfgrass and ornamentals in lawns and landscapes, golf courses, and greenhouse/nurseries. See the label for complete use directions and tolerant plant list.
NOT AVAILABLE FOR SALE IN ALASKA, HAWAII OR VERMONT. Always read and follow label instructions.

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Main Highlights

LEAF-TO-ROOT FUNGUS PROTECTION: Artavia 2 SC contains 22.9% azoxystrobin; the same active ingredient as the leading brand. Used by the pros, azoxystrobin moves within the plant to deliver trusted root-to-leaf protection.
FIGHT MULTIPLE FUNGI WITH ONE WEAPON: Combat more than 20 turf and 30 ornamental plant fungi with one product. Broad-spectrum Artavia 2 SC controls most foliar and soil-borne fungi including troublesome anthracnose, leaf spot, rhizoctonia, spring dead spot, and brown patch. See the label for complete fungi control list.
TOTAL PLANT DEFENSE: Artavia 2 SC is absorbed by leaves and roots for inside-out protection against foliar and soil-borne fungi. Plus, Artavia moves within the plant to deliver total defense from the root bottom to the leaf tip including tender new growth.
EASE THE WORKLOAD WITH EXTENDED APPLICATION WINDOWS: Many target fungi are labeled at application intervals up to 28 days so you can go longer between sprays. Keep fungi and workloads at bay with long-lasting Artavia 2 SC. See the label for complete use directions and application intervals.
APPLY PROTECTION WHERE YOU NEED IT: Approved for use on a variety of plants, Artavia 2 SC delivers powerful fungus control to turfgrass and ornamentals in lawns and landscapes, golf courses, and greenhouse/nurseries. See the label for complete use directions and tolerant plant list.
NOT AVAILABLE FOR SALE IN ALASKA, HAWAII OR VERMONT. Always read and follow label instructions.

8.3

Very Good

Nature's IQ

Nature's IQ Copper Fungicide. Controls powdery Mildew, Black spot, and Rust! for use on Roses, Flowers, ornamentals, Fruits, Vegetables, and lawns. 2-16oz Bottles(Twin Pack)

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Main Highlights

For use on roses, flowers, ornamentals, fruits, vegetables and lawns
Controls black spot, powdery mildew, rust, blight and other listed diseases
Controls dollar spot in lawns
Listed by the Organic Materials Review Institute (OMRI) for use in gardening of organic food and fiber
For use in hydroponics

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Main Highlights

For use on roses, flowers, ornamentals, fruits, vegetables and lawns
Controls black spot, powdery mildew, rust, blight and other listed diseases
Controls dollar spot in lawns
Listed by the Organic Materials Review Institute (OMRI) for use in gardening of organic food and fiber
For use in hydroponics

8.1

Very Good

Nature's IQ

Nature's IQ Copper Fungicide. Controls powdery Mildew, Black spot, and Rust! for use on Roses, Flowers, ornamentals, Fruits, Vegetables, and lawns. Concentrate 16oz.

Free Shipping

Main Highlights

For use on roses, flowers, ornamentals, fruits, vegetables and lawns
Controls black spot, powdery mildew, rust, blight and other listed diseases
Controls dollar spot in lawns
Listed by the Organic Materials Review Institute (OMRI) for use in gardening of organic food and fiber
For use in hydroponics

Check Price

Main Highlights

For use on roses, flowers, ornamentals, fruits, vegetables and lawns
Controls black spot, powdery mildew, rust, blight and other listed diseases
Controls dollar spot in lawns
Listed by the Organic Materials Review Institute (OMRI) for use in gardening of organic food and fiber
For use in hydroponics

8.1

Very Good

Leaves and Soul

Leaves and Soul Hydrangea Professional Liquid Fertilizer - Complete 3-5-4 Nutrient Blend Concentrate for Enhanced Blooming & Growth - Perfect for Garden & Indoor Plants - New & Improved Blend - 8 oz

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Main Highlights

HYDRANGEA SPECIALIZED NUTRITION: Expertly formulated for hydrangeas, our liquid plant fertilizer provides a perfect nutrient balance (3-5-4) to promote vibrant blooms and healthy growth. It ensures your hydrangeas flourish, enhancing your garden's beauty with their stunning flowers and lush foliage.
PROFESSIONAL-GRADE CONCENTRATED FORMULA: With a potent 3-5-4 nutrient blend, this houseplant fertilizer boosts root development, foliage, and flower production. Ideal for both indoor and outdoor flower plants, it delivers optimal nourishment for extraordinary growth, making it a favorite among gardening enthusiasts.
EASY APPLICATION, RAPID ABSORPTION: Designed for simplicity and efficiency, our liquid plant food ensures quick nutrient uptake, offering immediate benefits for growth and blooming. It's the perfect solution for gardeners seeking effective and hassle-free plant care.
ECO-FRIENDLY, SUPERIOR QUALITY: Made with the highest quality, environmentally friendly ingredients, our liquid outdoor & indoor plant fertilizer promotes robust plant health and growth. It's crafted for those who value ecological integrity alongside exceptional garden and indoor plant results.
SPECIALIZED BLENDS FOR DIVERSE NEEDS: Catering to a variety of flowering plants, Leaves and Soul offers specialized liquid house plant fertilizers for hibiscus plants, crepe myrtles, roses, plumerias, azaleas, and hydrangeas. Each blend is tailored to meet the specific nutritional requirements of these plants, ensuring optimal health, growth, and blooming.
LEAVES AND SOUL APP - Downloadable app for access to professional bonsai courses, lessons and great tips for bonsai and plant care. Read engaging blogs and see a gallery of images of amazing bonsai and plants.

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Main Highlights

HYDRANGEA SPECIALIZED NUTRITION: Expertly formulated for hydrangeas, our liquid plant fertilizer provides a perfect nutrient balance (3-5-4) to promote vibrant blooms and healthy growth. It ensures your hydrangeas flourish, enhancing your garden's beauty with their stunning flowers and lush foliage.
PROFESSIONAL-GRADE CONCENTRATED FORMULA: With a potent 3-5-4 nutrient blend, this houseplant fertilizer boosts root development, foliage, and flower production. Ideal for both indoor and outdoor flower plants, it delivers optimal nourishment for extraordinary growth, making it a favorite among gardening enthusiasts.
EASY APPLICATION, RAPID ABSORPTION: Designed for simplicity and efficiency, our liquid plant food ensures quick nutrient uptake, offering immediate benefits for growth and blooming. It's the perfect solution for gardeners seeking effective and hassle-free plant care.
ECO-FRIENDLY, SUPERIOR QUALITY: Made with the highest quality, environmentally friendly ingredients, our liquid outdoor & indoor plant fertilizer promotes robust plant health and growth. It's crafted for those who value ecological integrity alongside exceptional garden and indoor plant results.
SPECIALIZED BLENDS FOR DIVERSE NEEDS: Catering to a variety of flowering plants, Leaves and Soul offers specialized liquid house plant fertilizers for hibiscus plants, crepe myrtles, roses, plumerias, azaleas, and hydrangeas. Each blend is tailored to meet the specific nutritional requirements of these plants, ensuring optimal health, growth, and blooming.
LEAVES AND SOUL APP - Downloadable app for access to professional bonsai courses, lessons and great tips for bonsai and plant care. Read engaging blogs and see a gallery of images of amazing bonsai and plants.

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